This video presents an optical illusion of sorts in the form of white circles inside a larger red circle. The simplicity of the illusion is, to me, part of why it's of interest. Aside from the pattern that the video points out, a rotating square forms when there are four white circles inside the red one. Via IFL Science.
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Makes perfect sense to anyone who's ridden one of these on the midway: http://www.westcoastamusements.com/wp-content/uploads/2011/07/sizzler_504x360.jpg
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