Archer's art-o-matic

So this year I've teaching art to my children and two other children. It has been fun. I will try to post some of what we've done. In science we talked about kinetic energy and potential energy. Before they forgot everything they learned about it I decided to teach on kinetic art. I got the idea from the dickblick website.
Here's Archer's

http://www.dickblick.com/lesson-plans/art-o-motion-mechanical-sculpture/