Can You Believe Your Eyes?

“Can You Believe Your Eyes?” playing cards featuring optical illusions, ambiguous or impossible figures and other oddities, published by Y & B Associates. The cards were designed by J. R. Block and Harold E. Yuker, Professors of Psychology, Hofstra University, Hempstead, N.Y. and have novelty, educational as well as entertainment value They explore how humans perceive visual information. Optical illusions challenge the brain's visual processing system, revealing how perception can differ from reality. • See the box

Above: ‘Can You Believe Your Eyes?’ playing cards designed by Drs J R Block and Harold E. Yuker, professors of Psychology, Hofstra University, Hempstead, N.Y. Wide cards dated 1984 by Y & B Associates. Available from Intercol London and various other outlets, sometimes with different boxes or double boxes. Printed in Belgium. 52 cards + 2 jokers + an extra card + a 16-page booklet. The design of the card backs is the reverse image of the six of spades.

J. R. Block and Harold E. Yuker contributed psychological research in the study of attitudes toward disabled persons. They developed the Attitudes Toward Disabled Persons (ATDP) scale, which became a widely used tool for measuring attitudes toward individuals with disabilities. See Yuker, Harold E. and others : The Measurement of Attitudes Toward Disabled Persons►