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This Demonstration shows the illusion named after psychologist Walter Ehrenstein. The sides of the square appear to be curved against a background of concentric circles. You can change the thickness and color of both the circles and the square, as well as the circle spacing.
Contributed by: Pooja Nikki Bisarya (February 2016)
Open content licensed under CC BY-NC-SA
Wolfram Demonstrations Project
Published: February 1 2016