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Optical illusion: Book and Tube

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Book and Tube. Roll a piece of paper into a tube, and place a small book in the position shown in Fig 1, touching the tube of paper. Now look through the tube with the left eye, keeping both eyes open, the right eye looking at the book, and there will appear to be a hole through the book, as shown in Fig 2. 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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