| This nifty little puzzle allows you to insert a single coin into the perspex disc. This bit is easy. However when you try to remove the coin, it is not so easy. Whichever way you hold it or shake it, the ball bearings get in the way, and prevent you from getting the coin out. However if you know the trick, you can extract the coin in less than a second. A nice puzzle and an elegant piece of physics.
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