Visual illusions, their causes, characteristics and applications (1922)
Luckiesh, Matthew, b. 1883 · New York, D. Van Nostrand company · leaf 165
150 VISUAL ILLUSIONS to a source of light of rather small physical dimensions directly above the objects. The same objects il- luminated by means of highly diffused light (that is, light from many directions and of uniform intensity) appear as in b. Both objects now appear as disks. It is obvious… … Fig. 75. — A concave hemispherical cup on the left and a convex hemisphere on the right lighted by a light-source of large angle such as a window. ing upon which dominates the judgment or upon the formulation of the attendant assumptions. Incident- ally an appearance quite similar to that of a.…
Optical illusions
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