kinetic art
noun
art, as sculptural constructions, having movable parts activated by motor, wind, hand pressure, or other direct means and often having additional variable elements, as shifting lights.
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In less than a minute, the final ball had dropped to the ground and was pocketed by Joseph Herscher, 26, the kinetic artist behind this real-world Rube Goldberg machine.
From New York Times ● Jan. 6, 2012