Osman Khan and John Houck

enCODe is a projection of virtual fish on the café’s table tops. Using machine vision algorithms the fish avoid objects on the table (including hands and arms). The fish “swim” between projections via a network of networked computers. Each fish s also able to carry a message which is uploaded by visitors from a website and is released into the virtual pond when fish are trapped. Thus the project becomes both a fun interaction that takes advantage of natural activity over tabletops and a communal bulletin board recording thoughts and reflections occurring during the event.

Link: 

http://www.osmankhan.com/c4f3/worksamples.html