"Each of my kinetic sculptures is a wooden machine powered by a constant force spring which must be wound. While visually interesting sculptures when still, they become truly fascinating when in motion. After a simple winding they entertain with motion and soft sounds for varying lengths of time."
That's right. With no batteries and no electricity, David C. Roy creates these incredible moving sculptures made out of wood. The intricacy and visual appeal of his beautiful sculptures is unparalleled.Be sure to read the history of his work and how he started making these amazing creations.
If you're curious (and who isn't!), here is a page describing his techniques.
I strongly recommend you visit the site and see each sculpture page for yourself. Most have an animation showing how the motion looks. You won't regret.