Solarbotics Solarbotics GraviTrack Solar Marble Machine Kit

The Solarbotics GraviTrack Solar Marble Machine Kit moves the elegant hand-off mechanism that passes marbles to the top of a sweeping multi-level track. You will witness the fascinating step-by-step action of the arms as the geometry changes periodically. Patience is rewarded with the plunk, and roll of a successful motion cycle. The more light it gets, the more often it moves. It's a solar-powered stop-action motion! GraviTrack Solar Marble Machine Kit; Passes marbles to the top of a sweeping multi-leve...