Visual illusions, their causes, characteristics and applications (1922)
Luckiesh, Matthew, b. 1883 · New York, D. Van Nostrand company · leaf 217
VISUAL ILLUSIONS 202 gravity, to appear capable of tipping the remainder of the structure. In physics we would apply the term " moment." Each mass may be multiplied by its dis- tance from the center of gravity, thus determining its moment. For a building or other composition to appear stable the… … Fig. 89. — By decreasing the exposed length of shingles toward the top a greater apparent expanse is obtained. zero; that is, those tending to turn the figure in one direction must be counterbalanced by those tending to turn it in another direction. In appraising a com- position, our intellect…
Optical illusions
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