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The Delboeuf illusion is a phenomenon in which the perceived size of an object changes depending on the size of the surrounding shapes. In this optical illusion, typically examined using two concentric circles, a central circle of fixed size is perceived differently based on the size of the surrounding circle. History The illusion was first described in 1865 by Joseph Delboeuf. In his experiments, the diameters of concentric circles were compared. The results demonstrated that the size of the su