Cambrian Wave, kinetic sculpture by Reuben Margolin:
"When I first turned on the Cambrian Wave I was reminded of the wiggly creatures found in the Burgess Shale. These creatures, which flourished in the geologic time known as the Cambrian Period, had so many arms and legs that even their fossils seem to have movement. The lower part of the sculpture is made of birch, maple and basswood. Embedded pulleys add together the motion originating in the three top rings. A steel frame shaped like a bow holds the rings and tensions a white comb that separates the weave from the wave. The thimble in the central ring is filled with pulleys and so behaves like a fool’s tackle, doubling the motion in the single wavelength that acts over the entire sculpture. The little circles drive the edge riffles with the yellow dots. Each ring has its own motor, and because these motors all go different speeds, the sculpture is pretty much non-repeating."
Seen on Koprolitos, where you can watch the video