Mesmerizing -> This sand pendulum is pure math magic. http://pic.twitter.com/MUNl4NGkFn
— IM🍑HIM (@ziyatong) July 21, 2017
via Twitter https://twitter.com/ziyatong
July 21, 2017 at 07:19PM
Mesmerizing -> This sand pendulum is pure math magic. http://pic.twitter.com/MUNl4NGkFn
— IM🍑HIM (@ziyatong) July 21, 2017
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