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Optical illusions form structures in which curious little men can go up stairs to get to a lower place, hang pictures on the ceiling, and walk on walls.

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Topsy Turvies 1989, Philomel Books, New York, NY

ISBN-13: 9780399215575

Hardcover

Topsy Turvies 1970, Art Media Resources, New York

ISBN-13: 9780834820043

Hardcover