12 x 22 x 26 inches

Perpetuum mobile
according to sketches by Leonardo Da Vinci

Runs with 5 or 6 balls.

... and Rainbow
Reussbühl, November 1999

20 x 20 x 2.5 inches

The balls on the left hand side push the wheel down (thanks to the long lever-arm) and are thus able to keep the wheel turning. They can even pull up the weight on the left.