This photo caught my eye as I was exploring kinetic sculpture on Pinterest the other day.
Following the info I discovered it was created by Benjamin Cowden of Oakland, California and he has a video posted on YouTube which greatly enhances the understanding of any kinetic sculpture!
He also has a web presence at TwentySevenGears. Visit it to see more of his interactive mechanical sculpture.
I also noted by looking through his website that he is currently the head of the Kinetics and Robotics department at The Crucible in Oakland, CA And he teaches course there. Might be a resources for those of you looking to learn more about creating kinetic sculpture.