Four circles or diamond shape? optical illusion
thingiverse
Is it a diamond-like shape or four circles? 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, or a smaller to place directly on a flat surface. My other illusions: https://www.thingiverse.com/Matsemann/collections/matsemanns-ambiguous-cylinders The code & stuff: https://github.com/Matsemann/impossible-objects 
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