Swinging Sticks Kinetic Energy Sculpture
A desktop double pendulum: two aluminium sticks on a stand that keep rotating, changing speed and direction, powered by 4 AA batteries (not included). About 15 inches tall. The Swinging Sticks brand, sold on Amazon.
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The grown-up answer to "something like a Newton's cradle." Where a cradle stops after a minute, this keeps going: a hidden battery-powered pulse nudges the lower stick and the upper one tumbles in a way that looks random and never quite repeats. It is the most hypnotic object on this site and the most expensive desk toy, close to $100. It is also about 15 inches tall and 14 wide, so it needs a corner of a desk or a shelf, not a spot next to the mouse.
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