When I was at MIT, my room mate and I wanted to convert our 6.270 lego robotics kit into a fishmobile. A Fish-mobile is a vehicle that allows a fish to wander about a room based upon where it is in a fish tank. I recently posted my fishmobile idea into halfbakery hoping someone might actually do it. On searching deeper through the halfbakery I found that not only had other people also had this idea but someone had actually built a fishmobile as an installation at an art museum in 1998. The Mediated Encounters exibit by Ken Rinaldo at the Chicago Cultural Center was a fantastic implementation well worth taking a peek at.