The Jastrow Illusion is an optical illusion first defined by an American psychologist, Joseph Jastrow, more than 100 years ago. It involves two arc shapes of equal size, where the longer side of one arc is brought into contrast with the shorter side of the other.
When the images are arranged as they are in Marc Blank-Settle's video, the top left corner of the lower piece is actually shifted over to the right, to align with the bottom left corner of the piece on top.
This image should help shed some light on the mystery.
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