Optical Illusions
by Gianni A. Sarcone and Marie J. Waeber

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    Geometric Illusions 16    
   

First print this page!

Then, while moving slightly the page, stare at the disc opposite and you may see the central small disc floating

 


Floating objects

a)   b)
 

Repeat the previous operation with the disc a) or b)
and you may see its central cross floating
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