Ball Pit, Phase II

I posted a while back about a ball pit I’d installed in my room. Everything in that post was true, but the pictures were a little misleading.

Looking at that, you don’t necessarily realize how cramped those people are. I framed the pictures to make it look larger than it actually was (THAT’S WHAT SHE SAID). In fact, the ball pit was only about the size of a large bathtub or small jacuzzi. In the pictures on the site, it was barely deep enough to be buried in, and when we shrunk the area to make it deeper, it was barely big enough for two people.

When people came in and saw it, they were always startled at how small it was (also what she said). There was no room for hide and seek, and barely even space for surreptitious ball-pit groping. This was a terrible state of affairs. It was nice to sit in, but really, why bother having a ball pit if we were gonna do such a half-assed job of it?

Well, as of this week, the situation has been rectified.

We all chipped in and quintupled the volume of the ball pit. It’s now set up opposite a hacked-together server-projector system (yes, that means Guitar Hero in the ball pit — that’s a controller you see on the left). It’s lined with blankets and foam padding, and is oh so comfortable. We’ve had two people fall asleep in it already.

For sanitary reasons, we of course have a few rules:

It’s still only half the size of the recently-constructed Last.fm ballpit. But it’s finally big enough to really hide in, stretch out, and grab someone’s ass without them being sure who did it.

On the other hand, it has the slightly unnerving effect that we now have no idea how many people are in the apartment at any given time.

For science, the next experiment will be “what do cats think of ball pits?”

223 Responses to “Ball Pit, Phase II”

  1. suffer-cait Says:

    1st!
    and i am soooo jealous
    where do you live and may i visit?
    generic post i know

  2. Sean Neakums Says:

    You may want to add a couple of items to the sign before letting the cats in.

  3. elmizzt Says:

    That sign is made of win.

  4. lawngnomeslayer Says:

    How much did you have to put down for it? (that’s what she said).

    I think I originally did the calculations to fill my entire room but that actually looks feasible.

  5. Martin Says:

    How strong are the walls / joints? Individually they look fine, but they don’t (as a whole) look entirely structurally sound!

  6. xkcd Says:

    > How strong are the walls / joints? Individually they look fine, but they don’t (as a whole) look entirely structurally sound!

    They are held together by many zip ties at each joint, and overall it’s very sturdy (after a couple initial blunders). They’re anchored to the walls by rope — I drilled some blocks into the baseboard with pegs to hook onto.

  7. Will Says:

    “I cast Lvl. 3 Eroticism.”: http://bash.org/?104383

    :)

  8. Hendrick Says:

    Where can I buy cheap ball pit balls? I plan on building one of these in my dorm room.

  9. Sharkey Says:

    Guitar Hero in a ball pit…A fantasy even real rock stars couldn’t come up with.

  10. TheBrassPotato Says:

    If I wasn’t such a poor college student, I would loft my bed and build a ball pit underneath. As it is, my friends are thinking of pitching in so can I build one. And there’s nothing in the student handbook about ball pits being contraband, so I assume it’d be okay… right?

  11. Ed Says:

    I giggled like a schoolgirl on seeing the bash.org reference. I am a very very sad person.

  12. Charlie Says:

    I love that robe/wizard hat guy. It took me a moment to realize that that wasn’t your joke, Randall. It’s certainly the type that could have been.

  13. xkcd Says:

    > Where can I buy cheap ball pit balls? I plan on building one of these in my dorm room.

    You’re not gonna get cheaper than 10 cents per ball, as far as I can tell, and I don’t really know who the best suppliers are. eBay is no good — you need at least 1,000-2,000 for a ball pit that’s worth anything. I recommend calling toy stores and places that might have ball pits and asking them to forward you. I got mine from TinkerTots, because they had a decent deal on crush-proof balls, which were strongly recommended to me (you can jump around in the pit and not worry about them). But they cost more.

  14. Alex Says:

    I love how there is already some on the floor. I don’t envy you the inevitable constant picking up of balls.
    (and again that’s what she said)

  15. Mate Srsen Says:

    Yeah, “I put on my robe and wizard hat”. It’s awesome because *it feels so right*. Deep down I always suspected that was actually him in that chat. So naturally I laughed like a crazy person when I saw the sign.

  16. Laurie Says:

    Awesome :D We don’t have Guitar Hero in ours yet. That sucks.

    I already made my own version of the “no heavy petting sign”.. not quite as cool as that one (I have no drawing talent) but mine does utilise Lemonparty…
    http://www.flickr.com/photos/lastfm/2126705591/

  17. Last.fm Ball Pit → The Jim Whimpey Weblog Says:

    [...] It started with Randall Munroe over at Xkcd creating his own ball pit and documenting the experience. He later followed up with a larger ball pit. [...]

  18. Cesium Says:

    Last.fm pingback. I foresee a ball pit war.

    “Guitar Hero in a ball pit…A fantasy even real rock stars couldn’t come up with.”
    A literal mosh pit?

  19. Aaron Yanich Says:

    It’s time for a ball pit arms race! I await the creation of a swimming pool-sized pit. Say, you can breath at the bottom of a deep ball pit, right?

  20. Joshua Says:

    I suspect a cat would think “Wow, what a nice litter box!”

  21. letsburn00 Says:

    I can imagine a cat in there would immediately use the balls to form a unified theory of physics (and thus take over the world)

  22. ThemePark Says:

    I concur, Joshua.

    And sadly, I didn’t catch the bash reference until I had actually read the link posted above. And I had even read it before. I’m obviously not a big enough geek. *hangs his head in shame*

  23. devolute Says:

    I love the poster.

  24. Jordan Lund Says:

    Please let me know when you plan to do the cat experiment. I need time to invest in the companies that make Neosporin and Bactine.

  25. Karen Says:

    When I was a kid I used to always imagine living in a house that had a room that was filled with water. There was a little door you could crawl through way up high, and only a few feet of space between the water and the ceiling so you could breathe.

    Also, one of the rooms’ floors was entirely made out of mattress. It was a Bed Room.

    Please make these happen too. :-D

  26. Max Howell Says:

    I fell asleep in our ballpit after the epic “clean-up” operation.

    I woke up freezing and partially asphyxiated. The balls apparently don’t insulate heat and also are somewhat too packed for adequate carbon dioxide dissipation.

    Conclusion: not recommended!

  27. Riley Dutton Says:

    Hey, I noticed above that you stated “you need 1,000-2,000 balls for the pit to be worth anything”…how many balls does the pit you have now have in it? Was the 1,000-2,000 ball number for the first iteration of said pit, or this new one?

    Great idea, something I’m going to look into installing in my apartment one of these days…

    Big XKCD fan by the way! Read it every day! Keep up the great work.

  28. EugeneK Says:

    So where is the PayPal link to support Randall in the ballpit arms race? I’m in for $20

  29. EugeneK Says:

    … maybe even more if the store (when it’s back up) caries some “ballpit support” items

  30. doubleplus Says:

    What a waste. You’ll have fun with it for a year or two, but that plastic will be here forever. What about the materials and energy that went into creating it? Where will it be in 10, 100 years? http://www.mindfully.org/Plastic/Ocean/Moore-Trashed-PacificNov03.htm

  31. ILoveTheEnvironmentTooBut Says:

    If it makes you feel any better, I doubt this is a “do it for one year and leave it” sort of thing. While I can’t speak for the XKCD crew, I was thinking it would be fun to have in my apartment, then when I (someday) have kids they could have a blast with it. As long as the balls are usable, they will be used. Trust me, if a geek invests in a ball pit, it will get more than it’s fair share of use…Here’s to hoping it really will be here forever…

  32. gail Says:

    My next job interview:

    Interviewer: I am very impressed with your credentials, Ms. gail. Before we wrap up, do you have any questions for us?

    Me: Well yes, I do. As much as I impressed with your on-site gym, cafeteria, and espresso machine on every floor…. do you have ball pit?

    Interviewer: *stares at me*

    Me: I think we’re done here.

  33. hac Says:

    Rock on!

    @doubleplus - if we save everyone’s balls, we can fill the Grand Canyon in 50 years and have a big party!

  34. Elizab eth Says:

    gail - you should get a job at Google. They have a ball pit. Made of plywood, and obviously homemade.

  35. Ben Says:

    Rock on with “The Guild” reference.

  36. G. M. Palmer Says:

    Doubleplus — all those pictures are just propaganda from the corn growers who want us to use biodegradable plastic (remember corn pens?). Albatrosses don’t eat plastic caps — hippies drop them in rotten carcasses to make nothing in the world fun anymore.

    In other news, a styrofoam ball pit would probably be cheaper and fark up the enviornment even more.

    Strip mine the Earth,
    GMP

  37. Hogarithm Says:

    Anything can be hiding in that ball pit… human or … something else.

  38. Chris Says:

    Mr President! We cannot allow a ball pit gap!

  39. Nick Says:

    “For science, the next experiment will be “what do cats think of ball pits?””

    It will only end in heartbreak (and YouTube)…

  40. Mike MacHenry Says:

    I can tell you from experience that cats HATE ball pits. Granted, I only have a two cat sample size, but they told me in no uncertain terms that they speak for the rest of the cat community.

  41. Charon Says:

    I’d suggest building a subterranean ball pit going at least 10 feet deep with a hot air pipe spewing air from the bottom up, it would be very comfortable to sleep in and you get the wonderful sensation of being buried alive.

    @doubleplus
    I would feed dolphins bb rounds and laxatives just to be a douche bag. Your environmentalist notions are foolish, Now let us burn leaded gasoline in prayer. :D

  42. Alejandro Lizarraga Says:

    hmm….. how about making the ball bit using one of those inflatable pools instead of the metal structure? Would it be cheaper? more comfortable? what do you think?

  43. Ed Says:

    So when can I come over ?

  44. Matt Says:

    “On the other hand, it has the slightly unnerving effect that we now have no idea how many people^Wvelociraptors are in the apartment at any given time.”

    I fixed your post.

  45. Mike Says:

    That rules sign is almost what you see on the Singapore MRT. I’d suggest adding a No Durians rule. They smell pretty bad. http://flickr.com/photos/mroach/1470255690/in/set-72157602232109413/

  46. Trent Says:

    Bro, Janeane Garofalo is fucking disgusting.

  47. Super Aardvark Says:

    I was completely in the dark about the wizard hat line, and I have to say, after following the link, that’s the funniest **** I’ve seen in a long, long time.

  48. Jon Sagara Says:

    Please, please, puh-lease video tape the cat experiment.

  49. Courtney Says:

    I’d like to volunteer my two cats for the experiment.

  50. Jello B. Says:

    Hey Randall,

    http://validator.w3.org/check?uri=http%3A%2F%2Fblag.xkcd.com%2F

    (sorry if it’s been pointed out before, I’ve only checked the last few entries)

  51. gail Says:

    I second the videotaping of the cat experiment. I think the cat would be smart enough to climb out on the makeshift metal fence, once it stopped flailing about and sank to the bottom, then found its way to the edge. On the other hand, it may just sit there and wait for you in a cold fury, in which case you would have to extract it manually. I suspect it’ll be a lot like going into a shark tank blindfolded.

    Good luck with that.

  52. Alan Morgan Says:

    Janeane Garofalo causes great conflict within me. On the one hand she is made of hotness. Oh. Yeah. On the other hand, she smokes. Smoking is the anti-hotness as far as I’m concerned except… she’s still hot. Can it be that I actually tolerate smokers? That I actually find smoking (gulp) attractive under some circumstances? Say it ain’t so!

  53. David Says:

    What are those walls for? Let the balls roam free!

  54. beards Says:

    Why does Jeanene Garofolo have a beard?

  55. schtum Says:

    I’m modding up beards so hard…oh wait, this isn’t Reddit.

  56. Steven Says:

    <3 bash.org && xkcd!

  57. Shaze Says:

    Jeanene Garofolo: The things I would eat out of that woman’s anus!

  58. krikke Says:

    “i put on my robe and wizard hat”
    that’s genious, the legend of bloodninja lives on.
    wish i could have a tshirt with that sentence on it…

  59. Skolnick1 Says:

    “Was the 1,000-2,000 ball number for the first iteration of said pit, or this new one?” I really want to know the answer to that. I checked Tinker Tots and it’s about twenty cents a ball for crush-proof. With one or two thousand balls that only runs you up about $400 tops, which I would totally be willing to pay for a good-sized ball pit. But as you’re approaching the thousand-dollar range, my willingness decreases.

  60. Steve Says:

    If the cat gets lost in the ball pit… and Randall loses a small radioactive substance in the pit (which I’m sure he has just lying around), and he also loses a geiger counter connected to a hammer and flask of hydrocyanic acid (which he would ALSO just have lying around… does the cat both enjoy and not enjoy the ball pit at the same time?

  61. Remi Says:

    I don’t see why one would outlaw heavy petting - although the ball marks might leave some explaining to do… when I saw the first installment, I have to admit, it was one of the first things I thought!!!

  62. Mike Hufnagle Says:

    from what I saw, toys r us had the best deal on ball pit balls, at 10$ for 100.

    http://www.toysrus.com/product/index.jsp?productId=2267575

    and having a store where you could ask for giftcards to always helps too lol

  63. Pandora Says:

    I bet you could do something very Schrödinger’s cat-esque with the ball bit. Once the people are in there — how do you prove that they’re REALLY in there without looking?

    Oh, and also — D: can i has come over now plox?

  64. Sarah Says:

    Yeah, Skippy’s had a long standing “no sex in the ball pit” rule.

    “Children Ohio” is not as cool as “Have Bedroom” I’m disappointed with you ReCaptcha.

  65. Christian Says:

    It’s funny how you associate the ‘robe and wizard hat’-quote with Heavy Petting ;)

    Off-topic I have to admit your comics have been getting better and better lately, some really really funny ones so far (where I’ve been laughing in public and non-geeks come and look and stare at me confused) - this sort of humor is perfect :D

  66. Sarah Says:

    Sorry to double post, but our tests have generally proven that cats hate ball pits. Probably because they are afraid of the prospects of people not knowing that they’re in there. I bet dogs would be more likely to enjoy it. But I have no test subjects for that.

  67. Cesium Says:

    “On the other hand, it may just sit there and wait for you in a cold fury, in which case you would have to extract it manually.”
    Would cats actually sink through the balls? Would they dig? If the above is true, then sending ball-pitted cats (via eBay) would be an interesting way to conduct a ball pit war. Alternatively, use the Schrodinger-cat effect to introduce uncertainty in the cat’s position, causing it to spontaneously move to another ball pit. I wonder about the aerodynamic properties of ball pit balls — would they be strong enough to shoot into low orbit and send raining down upon hapless inhabitants of other ball pits? Maybe all ball pits around the world are the same and connected to a secret ball-pit dimension.
    “My god, it’s full of guitars.”

  68. Michael Says:

    I’d replace my bed with a ball pit if it was that comfortable.

  69. Scott Says:

    You are well advised to enforce a no food/drinks rule. At one point I installed a ball pit in my room, and after several drunken escapades, it was no longer fit for human habitation. What a mess to clean up… yeech!

  70. Josy Says:

    I am reminded of L-Space, from Discworld, the dimension that contains and is contained by all libraries everywhere, ever, including the ones that never got built.

  71. Atheist_Pending Says:

    to Josy: Oook?

  72. Amy Says:

    WAY KEWL!!!!!!

  73. ThemePark Says:

    “I second the videotaping of the cat experiment. I think the cat would be smart enough to climb out on the makeshift metal fence, once it stopped flailing about and sank to the bottom, then found its way to the edge. On the other hand, it may just sit there and wait for you in a cold fury, in which case you would have to extract it manually. I suspect it’ll be a lot like going into a shark tank blindfolded.

    Good luck with that.”

    Wearing a suit made out of fish, while pouring blood into said tank.

  74. Spurned Says:

    Can you upload that sign?

  75. Bruno Says:

    Dang. Now with the popularity of ball pits, the price of balls will go up. Time to find something more fun and be a head of the curb of interesting furniture. (I went from LoveSac to ball pits, the sex jokes just increased exponentially.)

    Maybe a giant trampoline in my apartment. Hmm…

    And I agree, please upload that sign.

  76. Kevin Coulton Says:

    I just want to say: when I was a kid, my dad built a little room underneath the stairs that led into the basement of our house with the express purpose of making a ball pit for my siblings and myself. It was about an 8′x4′ room and it defined my childhood. My dad is the best.

  77. Runa Says:

    Wow. I want one too :)

  78. Cheef Says:

    Invest in ball-pit balls!

  79. Johannes Says:

    Super cool

  80. Hiho Says:

    you know, if you’re worried about people hiding in the ball pit, you could use cats as a safety measure.
    “hmmm… i’m not sure if i’m the only person in my apartment. let’s check”
    *tosses kitty into ball pit*

  81. Alex Says:

    Hey Randall, i have no idea if you personally read these comments, or if the robot now does that too. I’m a recent convert to your strip, and i’ve found even more jewels of awesomeness in your blog. These days i go to class, do homework, and wait for every other day so that a new xkcd comic will make it out. I’m seriously reconsidering the value of the weekend. My better two thirds are currently at different Boston/Cambridge colleges. I’m not in a very complicated, emotionally invested threesome, i’m one part of a set of triplets. Please don’t do any strips on making out with sharers of a womb. I’m looking into building a ball pit of my own.

  82. Corey Says:

    For SCIENCE!, the next experiment will be “what do cats think of ball pits?”

    fixed that for you.

  83. Timequake Says:

    I’ve figured out that it would cost about $700 to fill my room from floor to ceiling (7 feet deep).
    To prevent balls from spilling out of the door when it was opened, I could have a turnstile just inside the door, with the bars spaced closely enough that the balls couldn’t fit through the gaps. Of course, one would have to reduce the density with which the balls were packed in order to keep them from getting stuck in the turnstile and completely blocking access to the room.

  84. Mike Says:

    Oh my gosh. I need to see your cat experiment!!! Make sure to take lots of pictures!

  85. Apropos Says:

    this thread is made of awesome, the cats did it for me, I think I teared up a bit.

  86. E Says:

    Lovin’ the Bash reference. Also, how long before someone hides in the ball pit to attack unsuspecting guests, then someone enters the room and jumps straight in the ball pit, crushing them?

  87. Em Says:

    Lovely.

    It’d be super annoying to have to look for car keys or cell phones in that though, so maybe you want to add something to your sign about leaving small personal belongings (that excludes body parts, before anyone starts that’s-what-she-said-ing) outside the pit.

  88. Craig Says:

    Just for calculations, how many balls are required to fill / can fit inside 1 cubic foot? I want balls so bad, but just need and idea of how many to fill my space.

  89. Sean Says:

    I love the little olive floating in the water bottle!

    I wish I had a ball pit… or friends to fill it with.

  90. Cesium Says:

    “To prevent balls from spilling out of the door when it was opened, I could have a turnstile just inside the door, with the bars spaced closely enough that the balls couldn’t fit through the gaps. Of course, one would have to reduce the density with which the balls were packed in order to keep them from getting stuck in the turnstile and completely blocking access to the room.”
    First of all, it would probably cost more than that. Also, if you filled the room completely, with any stable packing, you wouldn’t be able to turn the turnstile or even move into the room. Even if you managed that, the balls would fall out as the turnstile turned. Sorry for poking holes in your fantasy. :)

  91. Selkcip Says:

    That looks awesomemazing! Make sure to get footage of the cat as it keeps itself out of the pit by hovering.

  92. Dan B Says:

    When you finally sober up in a few years you’ll realize just how much of a monumental waste of money and time this was

  93. Greg H Says:

    @Dan B:

    …with some of the best memories ever.

  94. Katie Says:

    @Greg H:

    Oh, that is so incredibly true.
    Things that are this much fun are never a waste of time and money.

  95. Mind Gravy » Blog Archive » xkcd Says:

    [...] http://blag.xkcd.com/2008/02/27/ballpit-phase-ii/ [...]

  96. LizzyKai Says:

    I do believe that the Store require a “make-your-own Ball Pit Kit”

  97. squeaky Says:

    REALLY DO WANT

  98. Payntt Says:

    after and seeing the pix readin the blogs about how awsome this is ive decided im definity getting a ball pit when i have the room nd the funds for it

  99. Cesium Says:

    “That looks awesomemazing! Make sure to get footage of the cat as it keeps itself out of the pit by hovering.”
    No, that would be a squirrel…

  100. bumpgrrl Says:

    @Cesium:
    noooo, I think you would discover that cats too would quickly refine the ability to hover - have you ever tried to put a cat near a vacuum? In a bathtub? It’s amazing they way they can defy gravity.

    How deep is the ballpit? I’ve seen cats ploofed into snow, and they just bounce about unhappily until they find solid footing - but ball pits offer semi-footing, and the cat wouldn’t immediately hit “bottom”, depending on the depth. Hmmmm…. I am seriously intrigued by this “Ballpit part III - the Cat Dimension” experimental foray.

  101. Mr. Purple Says:

    All that you guys are going to realize about the cat is that it will walk upon the top, kinda like a non-Newtonian fluid

    The REAL question is what would the orange bunny do with a ballpit?
    sorry Lem and all those at frozenreality.co.uk

  102. Sarah Says:

    Cats sink if they let themselves. They generally try not to though. They generally try to escape as quickly as possible.

  103. liza Says:

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290209469957&ssPageName=MERC_VI_RSCC_Pr4_PcY_BIN_Stores_IT&refitem=290166386188&itemcount=4&refwidgetloc=active_view_item&usedrule1=StoreCatToStoreCat&refwidgettype=cross_promot_widget&_trksid=p284.m184&_trkparms=algo%3DDR%26its%3DS%252BI%252BSS%26itu%3DISS%252BUCI%252BSI%26otn%3D4

    not crush proof though

  104. Zoë Says:

    I will also, as Courtney has so graciously, volunteer my two cats. They are both feral rescues, so they are partially insane, and they are both under a year old, so they have a lot of energy.

    I would volunteer the third rescue cat, but as she is currently pregnant, I do not think she would approve, nor would my vet.

  105. Jonno Says:

    Can you take another picture of that sign, except from a straight angle so I can print it off and hang it up on my door?

  106. Hannah Says:

    Hey, nice work! That looks awesome!

  107. Myles Says:

    So I was thinking about the plastic also.

    The coolness far outstrips the environmental impact.

    PLUS! You can recycle plastic. If you can’t where you live find somewhere you can. If not send them to Canada we recycle.

    :P

  108. Sigmundur Says:

    Questions:

    1) Do you have a faq?

    2) Do you do something for living?
    2.1) are you living off the webcomic?
    2.2) would you like to be?
    2.3) do you really draw those three times a week or is there a publishing queue and you’ve kind of a huge stock of those and they just pop from somewhere en masse at uneven intervals?

  109. soapgirl Says:

    I volunteer my cat for the aforementioned experiment.

  110. Anon Says:

    @Sigmundur: Yes there’s a FAQ.
    http://www.xkcd.com/about/

  111. Nicolas Says:

    I ROFLed when I read the “I put on my robe and wizard hat” sign.

  112. Emil KR Says:

    Moar pix plx!! ;-D

    Seriously, I want to see more of the pit! How much does it fill in your apartment?

  113. Elisa Says:

    Turnstile guy (girl? Cant’ find the post now): You can fill your room half way up and put in a child gate ($20) to step over. Less complicated than a turnstile, and a lot less balls. Can’t believe people aren’t making more balls jokes about this one.

  114. Jenny Says:

    I think that any cat in a ball pit would be tempted to assume itself a mathematical sphere, so it could camouflage itself among the balls and exact its revenge on its owner…I wonder if that only works in theory….

  115. SheeEttin Says:

    Seriously, someone needs to make a formula for how much a ball pit will cost, based on area, depth, and crush-proofing. Because I definitely want to build one, but Ii have no idea how much it’d cost.

    Oh, and I instantly recognized the robe & wizard hat reference… I spend way too much time on bash.org… I get 2-3 quotes I’ve read before when I hit “random” now.

  116. Pax Says:

    I won the game? Really? I, I’m free?

    I”M FREEEEEEEE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  117. greenlee Says:

    this is such a great beacon of hope for the world.
    thank you.

  118. ThemePark Says:

    Today’s comic: Priceless.

  119. Zoë Says:

    Today’s comic is the one most significant step towards world peace, or at least towards my personal peace when interacting with 14 year olds, that I have seen in my life.

  120. Cesium Says:

    “Turnstile guy (girl? Cant’ find the post now): You can fill your room half way up and put in a child gate ($20) to step over.”
    So, kinda like the one in the comic? Randall’s waaay ahead of you.

    “I think that any cat in a ball pit would be tempted to assume itself a mathematical sphere, so it could camouflage itself among the balls and exact its revenge on its owner…I wonder if that only works in theory….”
    I assume its volume and thus diameter would be rather greater than that of the other balls. Either that or it can control its own density, in which case it could just turn into a black hole and get its revenge in a much cooler way.

  121. Lyk4n Says:

    About your new comic.. I hate you.. I lost the game because of you.. I hadn’t lost the game in like 2 days.. Now I have..

  122. Dom Says:

    I put on my robe and wizard hat!…

    however, NOT for the Socialist Janeane Garafalo.

    Here are a few Garafalo quotes for you:

    “Our country is founded on a sham: our forefathers were slave-owning rich white guys who wanted it their way. So when I see the American flag, I go, ‘Oh my God, you’re insulting me.’”

    “When Communist USSR was a superpower, the world was better off.”

    Sure ball pits are a party, but lets keep them separate from the Communist party thanks.

  123. Ed Says:

    “I think that any cat in a ball pit would be tempted to assume itself a mathematical sphere, so it could camouflage itself among the balls and exact its revenge on its owner…I wonder if that only works in theory….”

    For a spherical cat in a vacuum, methinks

  124. Lyk4n Says:

    Ok, I don’t hate you. But you could have avoided that one internet meme.. :(

  125. al Says:

    i volunteer my cat. he is experienced in the ways of science and is actually quite smart and compliant. on the other hand my other cat would just cower in fear like an idiot (so i don’t do any experiments with him, it just seems to cruel).
    my cat dealing with a sock http://www.youtube.com/v/nP5BEf4Pcio

  126. Gl1tt3r Says:

    Ooo I am so jealous! Still anxious for the day I get my own.
    It strikes me that I am awfully similar to the main girl in your comics. This is odd.

    Either way, the ‘won the game’ comic has bothered my subconscious. I don’t know how to feel. YOU’VE MESSED WITH MY MIND

  127. Jess Says:

    it occurs to me a potential downside to the ball pit…

    does this not create a perfect velociraptor hiding spot INSIDE your house?

    …just something to keep you up at night.

  128. silver rose Says:

    I think you should team up with the guys from LOLCATZ (check em out at http://www.icanhascheezburger.com) and get photos and captions for cats in the ballpit. That would be freaking hilarious.

  129. Koen_Vdd Says:

    Something my professor of fluida and soft matter mentioned (and I extended):
    If you would put a device in the balls which could charge them positive or negative alternatively on command, the balls would form a macroscopic crystalline structure from which it would be virtually impossible to escape. Could be very handy if things get out of hand.
    And of course with reference to Jess’s comment, it would be ideal for trapping raptors (not even Randall could go up against such an argument).

  130. Cesium Says:

    “If you would put a device in the balls which could charge them positive or negative alternatively on command, the balls would form a macroscopic crystalline structure from which it would be virtually impossible to escape. Could be very handy if things get out of hand.”
    Not to mention the process of creating the charges might well involve transferring large quantities of electrons between the balls, thus instantly revealing whether velociraptors or cats are hiding in the pit.

  131. killer-robot-clan.com » Ball Pits Says:

    [...] for one, hope that this becomes a growing trend. It’s entirely unjust that playpen ballpits discriminate against grownups, and [...]

  132. Kroz Says:

    I’m curious as to whether or not you could build up a ball pit by putting in various sized balls - for example, if the standard ball volume is V, a layer of perhaps 3V balls, then 2.5 V, 2 V, 1.5 V, and then fill in the rest with V. That way you still get the ball pit pleasure, but a far lower cost… perhaps. I don’t know if they sell such ball pit balls, but it’d be interesting to look into :)

  133. Alex Says:

    After using the calulator, it seems like the balls in that pit would only cost ~590 dollars. Granted $590 is not a trivial amount of money, but it’s a lot less than I would expect, here’s my math, incase anyone cares.

    150 square ft (hard to tell from the photo, but it looks like it’s about 12×12)
    4 ft deep
    3in balls
    64% packing efficiency
    10 cents a ball (toys r us has them for $10 per hundred)
    A total of 5867 balls for $586.70

  134. Alex Says:

    Update: I mixed up diameter with radius, so if I keep the other numbers the same, then that pit would require 46,936 balls for a cost of about $4,700. Damn it, the dream is dead . . . for now.

  135. Anonymous Tiburon Guy Says:

    Have you seen the one at EA Tiburon? It’s gotten deeper since the video: http://www.youtube.com/watch?v=m43GW9alZKs

  136. Smidge204 Says:

    Alex:

    Using TinkerTots as a guide (since that’s what xkcd used as mentioned above):

    http://www.tinkertots.com/500cobapitba.html

    These are the more expensive “crush-proof” type, of course.

    500 balls for $110, claimed to fill about 8 cubic feet. For budget purposes, estimate $14 per cubic foot. 48″ is also kinda deep - almost up to the chest on most people. I think 36″ is more appropriate, being about hip height and makign it possible for most people to climb over the barrier to get in/out. Assuming 3 foot depth, budget $42 per square foot. (Douglas Adams would be proud.)

    So 150 sq.ft. * $42/sq.ft. = $6300. Ouch.

    Going with the Toys-R-Us version ($10 for 100) and the same fill ratio for the same size, $6.25 per cubic foot ($18.75 per sq.ft. @ 36″ deep). The new price for the cheaper balls is now… $2812.50!

  137. OmegaLord Says:

    I wasn’t going to say anything, but my reCaptcha is “almost Edmonston”. What, Edmonston ain’t good enough for me?

  138. Pete Says:

    Who said ball-pits discriminate against adults? There’s a play area for kids near me - huge thing spread across three floors, with slides, ladders, foam rollers, tunnels, falling-down-hole-rubber-strappy-things and, yes, ballpits. And one evening a month they open it to adults instead of kids. And allow alcohol.

    A friend from work held her birthday party there last year. It was fucking awesome.

  139. Alison Says:

    Can I come work with/for you guys? If need be, I will be a coffee gopher. I’m also good with people and learn really fast! :p

  140. Simon Says:

    That is the most awesomest thing I have ever seen.

  141. Tucatz Says:

    I don’t know if this will work, but I thought I should point out this image. (In case embedding it doesn’t work, here’s the url: http://icanhascheezburger.files.wordpress.com/2008/02/funny-pictures-crazy-ebay-cat.jpg)

    Come on, admit it- you sent it to them.

  142. It's the Derv Says:

    You only lose the game if you thought about it on your own. If someone else mentions it, you have a grace period that you will not be penalized for thinking about it. The game lives on

  143. Cesium Says:

    What? The whole point is to make other people lose by losing.

  144. The Taped Crusader Says:

    The Game, while an ingenious social experiment, stopped being entertaining after about 10 minutes. Then I started cheating, and haven’t stopped.

  145. The Taped Crusader Says:

    The Game is nothing more than an ingenious social experiment. I started cheating about 10 minutes after I started “playing”.

  146. The Taped Crusader Says:

    so apparently I didn’t fuck up the catchpa, but rather am an idiot. that’s what I get for reading xkcd blag comments at 5 AM.

  147. Dave Says:

    thats awesome!!!!!
    help me build my population of my mini city
    go to azgardian.myminicity.com
    thank you

  148. Shooxjat Says:

    The real question is when Death will be done with that game. I’m already assuming he’ll lose.

  149. Puppet Says:

    This whole place smells like BO and sock sweat (sadly, that is also what she said)

  150. Cesium Says:

    “The real question is when Death will be done with that game. I’m already assuming he’ll lose.”
    What about The Game?

  151. shyguy Says:

    RIP, GG

  152. josh Says:

    i may be late with this, but do the guys at XKCD know about explosm.net? i think the comic “cyanide and happiness” complements the xkcd toons well.

  153. BCassidy Says:

    “Ultimate Game” was a fantastic tribute. I know you don’t often make direct references to real-life people and events, but this was very, very well done, and it made me even more impressed with your talent as well as with how you choose to use it. Thank you for a great strip.

  154. snhobo Says:

    in regards to the ball pit maybe you should dump 10-15 of these in it
    http://www.youtube.com/watch?v=-lWpS7NN3SY
    or even worse walking with dinosaurs in a ball pit
    http://www.youtube.com/watch?v=m_9GnP-lhaY&NR=1
    everything from now on i will look at like this “it would be better if it had a ball pit”

  155. Mr.B0t Says:

    Please upload a copy of that sign, it is hilarious.

    Although my sign would say No Heavy Petting [exceptions, Limor Fried, Kari Byron, Hayley Williams, or any combination thereof]

    Good Job on the Ultimate Game, its one of my favorites.

  156. David Says:

    Does anyone know of anywhere in England that sells ballpit stuff?
    (Bristol, ENGLAND). ‘Cos U.S. places charge abso-f*cking-lutely loads for p&p to England.

  157. x-Swamp Says:

    Woah. I really need to mke one of these.

    On the other hand. I need a new car.

    Such a hard choice.

    (The reading out recaptcha thing is so hard to hear, or understand, its like 99 chinese people reading out numbers at once.

  158. PhaseShifter Says:

    Ahh, but after the cat experiment comes phase 4: overflow bins + pneumatic tubes.

  159. Lemcott Says:

    WHOA
    500 BALLS FOR ABOUT 2 CENTS EACH
    just thought you all should know
    http://tinkertots.stores.yahoo.net/500cobapitba.html

    randall! please make that sign available to download!!!!!!

  160. Cesium Says:

    $100. That’s 20 cents each. ;)

  161. al Says:

    what if someone uses your ball pit to hide raptor assassins?

  162. stickman Says:

    Am I the only one that noticed that Janeane Garfalo has a beard in his sanitary poster? I applaud you for making your fantasy so public.

  163. Richard Says:

    stickman: It’s her hair, obviously, jeez….

  164. Chris G Says:

    Hey Randall,
    First, the ball pit is ace. When I finally get around to buying my own flat that will be one of the things I will be looking into.

    Second, 2000 AD (a British sci fi comic) is owned by Rebellion, a company which recently purchased Clickwheel, a company that you can by pdf copies of comics from. To help promote the site, they did a feature on the internet as a medium for distributing comics and did a sidebar recommending some webcomics. xkcd was one of them.

    Thought that was some very cool exposure.

    Chris

  165. clareabel Says:

    David- a quick google found me at woolworths: http://www.woolworths.co.uk/web/jsp/product/index.jsp?pid=50559079
    hope that helped!

  166. Ben Says:

    My extensive research has proven that there is no such thing as a spill-proof container. Especially when I am wearing a clean, freshly pressed white shirt.

    Haha… Weird side comment… The two words I have to type to submit this comment look just like ‘Bankrupt Clinton’… I’m sure that’s just randomly generated.

    Ben

  167. Mark Says:

    @Pandora, You took my schroedinger’s cat reference. Can a cat be in a ball pit? You’ll never know until it is observed.

  168. Cesium Says:

    Too bad it isn’t packing peanut pit, then it could be quantum foam.

  169. laxu » Blog Archive » Links 17 Says:

    [...] Ballpit II [...]

  170. Luffies Says:

    http://de.youtube.com/watch?v=p0h8kABzWWs&feature=related

    There’s a youtube video about a cat in a ballpit. I’ve been thinking about building my own ball-pit for 10 years now and I have it all planned out. When I finally move out of my parents house I’m going to dedicate an entire room in my house to ball-pitness. Any time someone comes over they have to bring a bag of 500 crush-proof balls to add to the fun otherwise they will not be admitted into the house. (This includes parentals.)

    After doing some calculations I figured out it would cost about 2650$ to fill a room 3m x 2m and 1m deep which is 6m³ so thats 13250 balls.. Better start saving now.

  171. eitje Says:

    Craig said: “I want balls so bad, but just need an idea of how many to fill my space.”

    …That’s What She Said.

  172. seedjar Says:

    @Alex: Nice idea about the different sizes, but small stuff sinks, sometimes even when it’s less dense than the other solids in the collection. Ever notice all the crumbs and raisins at the bottom of a box of raisin bran?
    I don’t need to say it, but this is awesome.
    ~seedjar

  173. FakeName101 Says:

    http://books.google.com/books?id=SEbwki1N0goC&pg=PA37&img=1&zoom=3&hl=en&sig=KE4mBIvhXWlmZI35rxDi-edtZhA&w=575

  174. FakeName101 Says:

    haha jkjk, actually, I’m gay…

  175. Bio Rules Says:

    This totally rocks! I wish I had space in my room to do this. Maybe I can convert my bed into one of those!

  176. heather (errantdreams) Says:

    I’m looking forward to the ‘what do cats think of ball pits’ experiment. I suspect if we did this in my home, we’d never see the cats again, except at meal time, at which point we’d have to somehow follow the howls to the bottom of the ball pit.

    You’re making me nostalgic for my MIT days, when visits to friends’ homes often resulted in such odd sights…

  177. Tomorrow Museum » Archive » Ballpit Says:

    [...] is an aside titled ‘Ballpit’ dated 3/18/08 all the cool kids are building ball pits (xkdc, last.fm.) You can too, just calculate. Just watch out for the heroin needles (an urban legend made [...]

  178. Heather Says:

    Does anyone know where I can get crush-proof balls in Canada? And unfortunately not even one of the better known places in Canada, but one of the smallesk tiny places in Canada.. haha.. We have a Toys R Us close by.. would their balls be crush-proof? Or does anyone know any sites I could Order from that would ship here? Ebay doesn’t seem to mention how durable any of their balls are.. making them an unsafe coice…

  179. Heather Says:

    also.. where did you get the pen? I’ve been looking at some online, but they only seem to be about 36 inches tall…

    BTW if you couldn’t tell.. I LOVE your ball pit!!!!!!!!!! I just saw it today, and I am totally making one in my living room! <3

  180. Generation LoL » Blog Archive » The World’s Biggest Ball Pit Says:

    [...] thing about ball pits. They just repel anger, it seems. Out of curiosity, I’ve been looking into xkcd-inspired ball pits, almost as a vacation from current events. Yes, we have been in Iraq for five years. Yes, Obama is [...]

  181. Rowadanr Says:

    Hmmm… If i can find a good supplier, perhaps i could install such a pit in the back of the future motor-caravan…

  182. Sidebar Spring Cleaning | Five Blondes Says:

    [...] The Big Word Project - what word defines your website? Check out “blonde” and “sisters” ;) xkcd’s ball pit: phase II! Hilarious Science Fair Experiments! Ah, science fairs. I watered, soda-ed, and coffee-ed plants. [...]

  183. TheChaosStrain Says:

    Next experiment….cats in a ball pit.
    I have only one thing to say to that Randall

    I support it but on one condition. It can’t have anything to do with buketz…ceiling catz….or kittehs.

    Please..? My sanity implores you to consider the ramifications of fueling the LOLcat craze!! o_O

    I need an answer!!

    Currently Contemplating the Latest Adventures of Dr. McNinja,
    TheChaosStrain

  184. Lebbeous Weekley Says:

    The typeface on your poster resembles that used by London Transport for the signage on the Underground and elsewhere. I wonder whether that was intentional. Nice!

  185. pau Says:

    pretty awesome pit you got =)

  186. Tony Dodd Says:

    For anyone in europe who’s after the balls, we got them from ‘euro-matic’ for a cheap price. I would recommend against toys-r-us/woolworths due mainly to the incredible price they slap on so few balls.

  187. DD Says:

    “The Game, while an ingenious social experiment, stopped being entertaining after about 10 minutes. Then I started cheating, and haven’t stopped.”

    what is this game you are atalking about?

  188. Hale-Bopp Says:

    I built my ball-pit back in ‘99 using balls I purchased from Ball-Pit Balls of America. Not sure if they’re around anymore (ordered them online), but they were cheaper to buy in cases of 500 rather than buying through places like Toys R Us at 100 a box.

    Here’s some images of my pit when it was on display for my senior art show in college…

    http://img.photobucket.com/albums/v77/halexf11/ballpit07.jpg
    http://img.photobucket.com/albums/v77/halexf11/ballpit06.jpg
    http://img.photobucket.com/albums/v77/halexf11/ballpit05.jpg
    http://img.photobucket.com/albums/v77/halexf11/ballpit04.jpg
    http://img.photobucket.com/albums/v77/halexf11/ballpit03.jpg
    http://img.photobucket.com/albums/v77/halexf11/ballpit02.jpg
    http://img.photobucket.com/albums/v77/halexf11/ballpit01.jpg

    Eventually, I set it up in my apartment. It was fairly sturdy and had mattresses underneath for cushioning, so you could jump around a little and stay somewhat safe. I’m no carpenter, so it’s not perfect by any means, but I enjoyed building it and it’s fun to party in!

    I dig yours, btw. The pillows make it all nice and cozy looking. Good for lazying around in, I bet. :)

  189. DD Says:

    Ah now I see. In retrospect, I was just really being my normal SUPERGAY self.

  190. guest Says:

    I had a similar idea a while back but I couldn’t find any balls at a reasonable price. Where did you get yours at?

  191. ZMTToxics Says:

    I am surprised you drew that as a horse versus 600watts and the horse loosing.

    1 Kilowatt (1000 watts) is 1 Horse Power. In context with the blag comic, the horse should have one being 400 watts more powerful. :D

  192. ZMTToxics Says:

    Whoopies, wrong post, I wanted to comment on the new one. Ignore.

  193. D-Train Says:

    ^actually 1 horsepower is approx. 0.75kw, and the competition was “a smallish horse (say, 75% the strength of a standard one)” - so approximately 560W worth of horse.

    I have only just discovered this webseat. This stuff is brilliant.

  194. D-Train Says:

    …and I have just repeated your mistake.

  195. That Guy Says:

    How can one person be so awesome? D:

  196. Chief Says:

    New rule? No sharks
    http://www.spikedhumor.com/article.aspx?id=125425

  197. Hörwolle Says:

    Ball Pit bei XKCD…

    Neid! Ist das geil! Ein riesiger Kugel-… ähhh… wie heisst das Ding eigentlich auf deutsch?? Egal, es ist geil! Schaut’s euch an:
    Ball-Pit Phase II

    [Nachtrag: Dies ist ein Re-Posting, siehe Tod und Verderben]…

  198. Paris Hilton Sex Tape Video 2 Says:

    20 hottest Paris hilton sex tape download…

    Paris Hilton Sex Tape Video 2…

  199. Adam Says:

    This might work for our living room.

    How many people can sit in the pit and watch a movie comfortably?
    Can you post a picture of a ball pit movie night?

  200. Amanda Gedraitis Says:

    Dear Randall,

    I want to come play.

    I *DARE* you to email me.

    Date, Time, Place. And I will be there.

  201. Tommy Fitzpatrick Says:

    That sign just gets ridiculous!

  202. Ikku Says:

    “it occurs to me a potential downside to the ball pit…

    does this not create a perfect velociraptor hiding spot INSIDE your house?

    …just something to keep you up at night.”

    Don’t be absurd. Velociraptors are allergic to ballpits.

    Also, Randall, you should know this post caused two seventeen-year-old girls to get into a catfight over who gets to stalk you and live in your house. There was jello involved.
    Though to be honest, the fight was brewing for a while even before this particular post set it off.

    Also also, will there be a return of Hat Girl? Hat Boy _was_ my favorite character until she showed up. She _needs_ to become a regular character!

  203. Andrew Says:

    For the love of ball pits, please sell the poster in the store! That’s a must have for every in-home ball pit!

  204. Jocelyne Says:

    @Heather from Canada

    Try
    http://www.tng-secure.com/scripts/tinley/gallery.php?cat=4&catalog=0&page=3

    Louise Kool near Toronto…. no idea about shipping, but they’re helpful people in general.

  205. Grim Says:

    That is awsome… I know what im making in a year or two XP

  206. Orthopedic Wrist Braces Says:

    Orthopedic Wrist Braces…

    I found your site on technorati and read a few of your other posts. Keep up the good work. I just added your RSS feed to my Google News Reader. Looking forward to reading more from you….

  207. Badger Boy Says:

    where did you get the walls?

  208. badger boy Says:

    Where did you get the walls i would really like to know

  209. renke Says:

    4.5k balls and an inflatable swimming pool do a quite nice job

    http://flickr.com/photos/himmelskratzer/sets/72157604950775896/
    http://www.ipernity.com/doc/beredt/album/65019

    costs are ~ 7 Euro cents/ball

  210. The Smirking Cynic 2.0 ? Blog Archive » Ball Pit Says:

    [...] a favor and check them out. But the beautiful thing (that I just learned) is that the guy actually made his own ball pit. And now I love him that much more. RSS feed for comments on this post. TrackBack URL Write a [...]

  211. Jess Says:

    @halebopp:
    Completely frickin’ amazing!!!! Must have been the coolest art exhibit ever :-)

  212. Five by Five » Blog Archive » Ball pit fever spreads Says:

    [...] this year last.fm created a ball pit at work. Well it seems the ball pit fever has spread to XKCD. Yet more evidence that we need a ball pit [...]

  213. Jolly Llama Says:

    Using basic structures and properties of materials, I have simple formula for calculating how many balls you would need for a perfectly packed ball pit.
    http://i31.photobucket.com/albums/c384/darkmagussa/Picture-1.jpg
    Thats the lattice concept used for this.

    Basically, with each ball being 3 inches in diameter, and the diagonal of one unit in the lattice being equal to 2 balls wide, the cube has a diagonal surface bisecting length of 6 inches. Its a simple 45/45/90 triangle, so that length is equal to one side multiplied by root 2. That means each edge of the unit cube is 4.2426 inches long. s^3 = volume obviously, so a unit volume for the lattice is approximately 76.367 in cubed.
    Now each unit houses a half ball on each of the 6 surfaces, and 1/8th ball on each of the eight corners. this is the equivalent of 4 balls. divide 76.367 by 4 and that gives you a unit volume per ball of 19.092 inches cubed. Now all you have to do is find the volume you are trying to fill. Lets say its a 4 foot deep, by 10 foot by 10 foot pen. thats 48*120*120 = 691200 inches cubed. divide that by unit volume and to absolutely pack the pen you would need 36,203 balls.

    Of course along each surface you would have to cut the balls in half because of the analyzed model of the lattice unit, and you’d have to account for imperfections in your lattice, and room for displacement when you and hordes of friends get drunk and play guitar hero- which is why this number is outrageously large and way more than would be useable, and was truly just a bored mathematics exercise. my guess is you could get away with about 1/4th of whatever number is calculated, making it about 9k balls for a 4×10x10 ft pen before people get in, and to make room for displacement cut a foot off of that, and only fill a 3×10x10, meaning maybe 7000ish balls. I’m awake too early.

  214. paranoidcleanfreakfunspoiler Says:

    what about all the hairs and skin particles and grease that will slowly build up in there?

  215. possiblemadscientist Says:

    @seedjar, @Kroz

    You probably already know this: “small stuff sinks” is known as the “Brazil nut effect”.

    Is that why Kroz suggested putting in the largest stuff first?

  216. Pavan’s Blog » My New Goal! Says:

    [...] find another place to build one).  To give you an idea the awesome people from xkcd had loads and loads of fun and not to mention that wasn’t even as “epic” as the Last.fm [...]

  217. Tibia Says:

    Nice, a ball pit in your room (yealous) :D

  218. Jammie Says:

    wal-mart has 100 balls for $9.88

  219. BS Says:

    Boom de-ya-da!

  220. Captain Shite Says:

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  221. ball pit balls Says:

    [...] [...]

  222. Childhood memories. | benmcfadden.com Says:

    [...] few months after XKCD’s original ball pit they expanded upon it to a very large, and quite enjoyable ball pit. I saw the blog post at the time, but it didn’t [...]

  223. Mahndo Says:

    I took initiative and built my own ball pit. Thanks for the inspiration.

    Check it out: mahndo.blogspot.com/2008/06/second-of-three-sagas-ball-pit.html

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