Remember the Space Wheel? It is a cool physics toy from Andrews Mfg that produces the illusion of perpetual motion. These Small & Large Dolphin Wheel Physics Toys work in a very similar way. The wheels have magnetic sides to interact with the base. There is an electric motor inside each base.
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Small & Large Dolphin Wheel Physics Toys Compared -- Gadgetify
Without the battery, the wheels stop after a a few seconds. But with a full battery, they will keep going back and forth.
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