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The bathroom tile creating this illusion can be found in the Men’s room on the 4th floor of Old Minor (same floor as Minor 489). And yes, ladies it can also be found in the Women’s room on the 3rd floor.

The light tan tiles are squares, but notice that each tan pair appears to have a wasp waist (that is, their sides don’t appear to be parallel). The inward bend is most obvious on tiles near, but not on the point of fixation.

We don’t know the explanation for this illusion, but it’s related to Fraser’s Spiral and the Café Wall Illusion.

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