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Optical illusion: Cloisters

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Cloisters. A very striking optical illusion is seen in this picture. It appears as though the two sides of the arch would not join up correctly, but this is simply due to the post coming in front and covering the lines. The two sides will join up perfectly on the left hand edge of the post. Illustration for one of a set of cigarette cards on the subject of Optical Illusions, published by Ogden's, early 20th century.

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