. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . Fig. 1406.—Hering Figure. in reality, a universal principle which can be freely invoked for theexplanation of these illusions. In the angle illusion (Fig. 135), the acute angle at the vertexis said to be over-estimated, because the true prolongation of oneside falls within the apparent divergence of the sides. The illusionappears to depend in part on the disparity in length of the two lineswhich form the angle; if both are treated alike, as in Fig. 13
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . Fig. 1406.—Hering Figure. in reality, a universal principle which can be freely invoked for theexplanation of these illusions. In the angle illusion (Fig. 135), the acute angle at the vertexis said to be over-estimated, because the true prolongation of oneside falls within the apparent divergence of the sides. The illusionappears to depend in part on the disparity in length of the two lineswhich form the angle; if both are treated alike, as in Fig. 136, theeffect is reduced, made uncertain, and may even be reversed. Judd, op. cit., A. H. Pierce, Studies in Auditory and VisucH Space Perception(New York, 1901), p. 271. 446 PRESENTATIONS OF SENSE Reduplication of the angle illusion gives such effects as are seenin Fig. 137, or, in more pronounced form, in Fig. 138, whichlast presents the long-famous Poggendorf illusion. Various degreesof this illusion are produced by dissecting the figure and presentingits parts separately; thus the illusion is, if anything, strengthened byleaving only
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