Here is another amazing wall-mounted wooden sculpture by David C. Roy called Variation Fractal. Made in 2004, this piece is part of a larger series in which Roy continued to experiment with the patterns created by six overlapping wheels orbiting a common center, each holding a particular orientation by rotating in the opposite direction from its orbital motion.
From the artist's web site:
Variation-Fractal is the final design of the 2004 Variation series. In this piece I've been exploring the "reverse gear" effect that occurs at the center of the upper wheel assembly. I experimented with a number of forms before settling on the spiral form. I liked the way the "reverse gear" constantly changed form through the period of the motion.
Visit the Wood That Works web site to see more kinetic sculptures by David C. Roy.