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Optical illusion: Letters Appearing Out of Upright, by Dr J Fraser

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Letters Appearing Out of Upright, by Dr J Fraser. These letters, although they do not appear so, are perfectly upright and exactly parallel. This wonderful optical illusion is caused by the thick brown lines, which deceive the eye as to the true shapes of the letters. 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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