The Art of Optical IllusionsThe Art of Optical Illusions

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Maurits Cornelis Escher (Dutch, 1898-1972), Balcony, 1945, lithograph, 11 3/4 x 9 1/4 inches (29.7 x 23.4 cm), National Gallery of Art, Washington, DC. In the center of this picture of a hillside town, Escher said he tried to break up the paper's flatness by "pretend[ing] to give it a blow with my fist at the back, but . . . the paper remains flat, and I have only created the illusion of an illusion."

Victor Vasarely, Blue / Red, 1983, silkscreen, from an edition of 267, 23 x 23 inches (58.5 x 58.5 cm.

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The Official Vasarely WebsiteThe Official Vasarely Website

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"Straight or curved, horizontal or vertical, parallel or divergent, all lines have a secret relation to emotion" — from a statement by Charles Blanc.

  Bridget Riley (British, 1931-), Intake

Bridget Riley, Cataract.