This wave features billiard balls swinging from different lengths. They each hypnotically swing in their own little arc, making wonderful waves patterns together to the sounds of Moonlight Sonota. See a couple more of videos that show what this looks like from the side at mental_floss. Link
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NeatoShop's last T-shirt sale of the year: get 20% off all T-shirts. Expedited X-mas shipping available - get yours now before the sale ends Dec 19, 2014.