Delboeuf illusion

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A visual illusion in which a circle surrounded by a concentric circle of slightly greater diameter appears larger than another circle of the same size surrounded by a concentric circle of much greater diameter (see illustration). [Named after the Belgian physicist and psychologist Joseph Rémy Léopold Delboeuf (1831–96) who published it in 1893]

Delboeuf illusion. The two inner circles are the same size.

Subjects: Psychology.

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