Circle with inner square, or opposite? Optical illusion
Description
Is it circles with a squares inside? Squares with circles inside? Rotating it or viewing in the mirror shows something else! Based on math by Kokichi Sugihara. Best viewed at 45 degrees angle. Includes a rotatable figure+support. My other illusions / ambiguous cylinders / impossible objects : https://www.thingiverse.com/Matsemann/collections/matsemanns-ambiguous-cylinders The code & stuff: https://github.com/Matsemann/impossible-objects 
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