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This is a simple and inexpensive way to create a multitouch surface with optical lasers, a webcam and some software that I wrote. The project uses the interaction with the surface to generate sound based on the position and amount of touch points. I use the surface as a musical instrument, but there are innumerable possibilities for such an easy to make multitouch surface.
Web site: http://cnmat.berkeley.edu/recipe/laser_multitouch_surface
Yotam Mann
I am a fourth year music and computer science major at UC Berkeley. I like bikes, cooking, the sun, sailing, and making lots of music.