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"Yes that's clearly a ..no, wait...it's actually a ...no..."
Prepared by professors of psychology in the Gestalt tradition, Dr. J. Block and Dr. H. Yuker of Hofstra University. Contains 52 different visual illusions and instructions. Examples: illusions in color, color reversal, ambiguous figures, size and figure distortion. You won't believe your eyes!
Card size 3-1/2" L x 2-1/2" W.
Also available- Optical Illusions Cards ( item # 3153683) - see below