Three arc illusion

Three arc illusion

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This image is part of the feature Illusions

Credit: SCIENCE PHOTO LIBRARY

Caption: Three arc illusion. The three arcs shown give the impression of belonging to circles of increasing radius when viewed from top to bottom. They actually come from circles of the same radius. The illusion is a demonstration that the larger the arc shown, the smaller its radius appears - for short arc segments humans appear to underestimate the curvature. That they are produced by circles of the same radius is demonstrated in image T478/460.

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Keywords: ambiguity, ambiguous, circle, circles, illusory, neuroscience, optical illusion, panoramic, perception, psychology, radius, three arc illusion, trick, trickery vision, vision, visual, visual trick

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