The Koffka ring is a geometric optical illusion discovered by the German psychologist Kurt Koffka. Figures 1 to 3 each show a circular ring colored a uniform shade of gray, the lower half of which is on a black background and the upper half on a white background.
The Koffka ring is a geometric optical illusion discovered by the German psychologist Kurt Koffka. Figures 1 to 3 each show a circular ring colored a uniform shade of gray, the lower half of which is on a black background and the upper half on a white background.
Source: Wikipedia "Koffka ring" · CC BY-SA 4.0
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