For millennia, man has yearned to block the sun (with black plastic balls). If an un-covered public water reservoir contains bromide, sunlight will combine the bromide with the chlorine used for reducing bacteria -- thus poisoning the water with carcinogenic bromate. Blocking the sunlight is the answer, but building a permanent cover for a huge reservoir is very costly. The solution for LA-area reservoirs, a few years ago: cover the entire water surface with millions of floating "bird balls", in effect turning the reservoir into a 10+ acre ball pit. [more inside]
posted by LobsterMitten on Oct 30, 2011 - 46 comments

The Last.fm guys really wanted a ballpit, inspired by the xkcd blog. Pictures.
posted by nthdegx on Jan 16, 2008 - 33 comments

Showbiz Pizza Place. (aka. Chuck E. Cheese) is every American child's right of passage. I, personally, am still haunted by nightmares of the animatronic terror that was The Rockafire Explosion. I can still hear their soulless robotic chanting. No mention however in the employee handbook about having to clean the 'accidents' in the ball-pit. (I only did it once after a large soda.)
posted by Stan Chin on Sep 4, 2002 - 25 comments