Visual illusions, their causes, characteristics and applications (1922)
Luckiesh, Matthew, b. 1883 · New York, D. Van Nostrand Company · leaf 81
68 VISUAL ILLUSIONS changes are rapid and easy to bring about. At other moments he will encounter an aggravating stubborn- ness. Occasionally there may appear a conflict of two appearances simultaneously in the same figure. The latter may be observed occasionally in Fig. 30. … Fig. 30. — Reversible'cubes. Eye-movements are brought forward by some to aid in explaining the changes. In Fig. 30 a reversal of the aspect of the individual cubes or of their perspective is very apparent. At rare moments the effect of perspective may be com- pletely vanquished and the figure be…
Optical illusions
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