Battery Powered Cat TV

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“The science behind what makes these sculptures move is called a homopolar motor: a direct current electric motor that produces constant circular motion. They’re remarkably easy to build. Yukawa’s sculptures, on the other hand, are not. To build the homopolar motar, all you need is a small magnet on one end of a battery. Then place a free-standing conducting wire on top, thus completing the circuit.”

[Found here.]

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