David C. Roy has been making his own unique style of kinetic wooden sculptures for a while now. Here one of his first. According to Roy, "Tumbleweed was one of the last sculptures I designed in 1976. I was looking for a way to create more rotations of the "pendulum" wheel before reversing." Unlike his more recent works which are spring-driven, this one is powered by a falling weight. But all of the classic David Roy hallmarks are there: beautiful wooden forms, spinning gracefully, almost silently, creating interesting movements and patterns.
You can see more kinetic sculptures by David C. Roy at his web site, Wood That Works
[ Thanks Christoph! ]