Solarbotics GraviTrack Solar Marble Machine Kit

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GraviTrack Solar Marble Machine Kit Passes marbles to the top of a sweeping multi-level track Fascinating step-by-step action of the arms as the geometry changes periodically Solde ring required Ages: 12+ 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! Show more