Shepard tables (aka Turning Tables) is an optical illusion first presented by Stanford psychologist Roger N. Shepard in his book Mind Sights (1990). The two table tops look as if they have different shapes, with the one on the left appearing long and thin and the one on the right appearing approximately square shaped. In actuality, aside from a rotation of 90 degrees, the tops are identical.
Here's an amazing variant of this illusion titled "Rooftops" by Vesna Stojakovic which was entered in the 2017 Best Illusion of the Year Contest.
- Wikipedia: Shepard Tables
- Digg: The Power Of Depth-Perception, Illustrated By One Mind-Bending Illusion
- OpticalIllusions.net: SHEPARD’S TABLES – WHAT’S UP?
- ResearchGate: Paradoxical Perception of Surfaces in the Shepard Tabletop Illusion
- Scientific American: Countdown to the Best Illusion of the Year Contest and Second Honorable Mention: "Rooftops" Illusion
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