The balls seem to be moving in circular orbit, but when you take a closer look, you'll see that each ball is moving along a straight path. This clever "circle in circle" optical illusion, built by YouTube user veproject1, is based on the mechanical design by 16th century Italian polymath Gerolamo Cardano.
Check it out - via The Awesomer
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Thanks, Stan! The credit should go to Paul Strauss of The Awesomer, who found it first :)
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Nice find, Alex. Thank you.
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