An optical illusion. These circles are concentric.
(Baingio Pinna and Richard L. Gregory, “Shifts of Edges and Deformations of Patterns,” Perception 31:12 [December 2002], 1503-1508.)
An optical illusion. These circles are concentric.
(Baingio Pinna and Richard L. Gregory, “Shifts of Edges and Deformations of Patterns,” Perception 31:12 [December 2002], 1503-1508.)
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Also the nice books give you fifty problems to establish understanding while the scary books give you two trick questions.