Baum, Arline. Opt : : an illusionary tale / [electronic resource] / by Arline and Joseph Baum.. — New York, N.Y., U.S.A. : : Puffin Books,, 1989, c1987.. — 32 p. : : ill. (some col.) ; 23 cm. — (Picture puffins).
Анотація: A royal family and court present a variety of optical illusions which are explained at the end of the book. Includes some suggestions for making your own illusions.