Jastrow Illusion
thingiverse
The Jastrow Illusion, also known as Ring-Segment illusion, Wundt area illusion or Wundt-Jastrow illusion makes it look as if one of the two bowls is smaller than the other. To create the effect, print two of these bowls at the same size, then place them next to each other (long sides touching), line up the left edge.
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