THE INFLUENCE OF ANGLES
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As previously stated, no satisfactory classification of visual illusions exists, but in order to cover the subject, divisions are necessary. For this reason the reader is introduced in this chapter to the effects attending the presence of angles. By no means does it follow that this group represents another type, for it really includes many illusions of several types. The reason for this grouping is that angles play an important part, directly or indirectly, in the production of illusions. For a long time many geometrical illusions were accounted for by “overestimation” or “underestimation” of angles, but this view has often been found to be inadequate. However, it cannot be denied that many illusions are due at least to the presence of angles.