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Celt
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This is a celt or rattleback - an object that in spite of its simplicity has a preferred direction of rotation when you spin it on a table. Spin it the wrong way and it slows, starts rocking, and often starts spinning the right way.
A demonstration: https://goo.gl/photos/vXfbPJD4R7eT9vmL6
A demonstration: https://goo.gl/photos/vXfbPJD4R7eT9vmL6
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