Visual illusions, their causes, characteristics and applications (1922)
Luckiesh, Matthew, b. 1883 · New York, D. Van Nostrand company · leaf 102
THE INFLUENCE OF ANGLES 87 more or less to the total result. In Fig. 47 a series of concentric arcs of circles end in a straight line. The result is that the straight line appears to sag per- ceptibly. Incidentally, it may be interesting for the reader to ascertain whether or not there is any doubt… … Fig. 48. — Distortions of contour due to contact with other contours. circles. To the author the arcs appear distorted from those of true circles. In Fig. 48 the bovmding figure is a true circle but it appears to be distorted or dented inward where the angles of the hexagon meet it. Similarly, the…
Optical illusions
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