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.)
Wikimedia CommonsLeni Riefenstahl, the filmmaker behind some
In the early 1900s, the White Star
National Center for Missing and Exploited ChildrenNicholas
Public DomainA 3,300-year-old depiction of King Tut
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