In the spring of 2010 I was an intern at Statens Museum for Kunst (The National Gallery of Art) in Copenhagen.
As a part of this internship, I worked to develop a system that allows museum guests to paint on the wall using a Wii remote.
I never actually managed to set it up at the museum but it was fun and interesting to develop none the less.
Below is a pretty lo-fi video presentation of the concept and system in a prototype setup: