[_ouxp]

No mention of "You're in Control" from MIT Media Lab, the clear intellectual predecessor.

http://web.media.mit.edu/~hayes/mas863/urinecontrol.html

[nervechannel]

Also a friend of mine built something similar for an art show a couple of years ago:

http://riccarvalho.com/project/global-warming/

Not sure if it was inspired by the MIT thing.