Projet très intéressant d'art interactif.
Very interesting project of interactive art.

"One in a series of interactive artworks using shadow tracking created by Zack Booth Simpson & Mine-Control in 2001. Colorful sand falls collects on the shadow. Squeezing the sand pulls the color out and the pure color can be mixed like paint. Shown at SIGGRAPH 2002 and permanently installed in numerous museums worldwide." Info from You-Tube

http://www.mine-control.com/