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The Math Behind The Hollow Face Illusion With Thinky the Dragon

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Published on Mar 18, 2014

ThinkFun CEO Bill Ritchie explains how the Hollow Face Illusion works with a giant Thinky! This optical illusion is a fun DIY activity for kids. Watch the video to find out exactly how Thinky's illusion works!

http://www.mathaware.org/mam/2014/cal...
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