It's been brought to my attention that not everyone knows what a zoetrope is. Here's the Wikipedia entry http://en.wikipedia.org/wiki/Zoetrope The piece that I'll be making at What It Is has a twist on the idea. First of all the animation is a series of models. Also, the inside and outside of the machine move in different directions. The advantage is that the animation can be moved up to the shutter (drum) The viewer sees a larger animation in 3D with a better feel of foreshortening as things move towards and away. The video below is a prototype I made from cardboard. The bird animation (12 models) were 'stolen' from the Clark video further down the page.