Wonderful station that was truly intriguing to my students. I set up two overhead projector under a table and placed some paper over the edges. The students were asked to make free-form shapes to project onto the 'screen'.
In addition to this video, I learned that I needed to have more rules in place for who get's to use the overhead projector, and for how long. I would show them that they must cut a shape out, and get in line. The line was watching the shadow show. When they got to the projector, they should set the timer for 1 minute. Students can have as many times as they wanted as long as they got back in line. These rules worked out well and kept the peace.