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(YouTube)   The penis spinning   (youtube.com) divider line
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    More: Cool  
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1142 clicks; posted to STEM » on 26 Nov 2020 at 1:50 AM (13 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook




Ames Window

Deane makes a trapezoid window from a sheet of card. When it spins it appears to change direction. A baffling optical illusion!

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