I stumbled upon something which I thought would be very interesting to many artists on the list. http://www.k2.t.u-tokyo.ac.jp/members/alvaro/Khronos/

near the end of this video, it describes a method of interaction with a projection. what they do is project an image from behind, then shine infra red light at the back of the screen. a IR camera apparently is able to sense depressions in the screen.

this sounds right up "our" ally. has anyone tried it?

at the very least its fricken amazing. -matt