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Visual illusions, their causes, characteristics and applications (1922)
Luckiesh, Matthew, b. 1883 · New York, D. Van Nostrand company · leaf 71
66 VISUAL ILLUSIONS … Fig. 17. — Equal circles which appear unequal due to contrast (Ebbinghaus' figure). CL Fig. 18. — Equal circles appearing unequal owing to contrasting concentric circles.Optical illusions
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