Chapter 7 - Optical Illusions of Depth and of DistanceWe cannot live only for ourselves. A thousand fibers connect us with our fellow men. - Herman Melville
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Chapter 7 - Optical Illusions of Depth and of Distance

When any of the ordinary criteria of relief or of distance are apparently modified, optical illusions of depth and distance are possible. There are many illusions of this sort, such as the looming of objects in a fog; the apparent enlargement of the sun and moon near the horizon; the flattening of the "vault" of the sky; the intaglio seen as relief; the alteration of relief with lighting; and various changes in the landscape when regarded with the head inverted. Certain data pertaining to the objects viewed must be assumed, and if the assumptions are incorrect, illusions will result. An increase in the brightness of an object is accompanied by an apparent movement toward the observer, and conversely a decrease in brightness produces an apparent movement in the opposite direction. H. A. Carr's report on optical illusions of distance, motion and movement is discussed.
Distance Optical Illusion
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When any of the ordinary criteria of relief or of distance are apparently modified, optical illusions of depth and distance are possible. There are many illusions of this sort, such as the looming of objects in a fog; the apparent enlargement of the sun and moon near the horizon; the flattening of the "vault" of the sky; the intaglio seen as relief; the alteration of relief with lighting; and various changes in the landscape when regarded with the head inverted.

Certain data pertaining to the objects viewed must be assumed, and if the assumptions are incorrect, illusions will result.

An increase in the brightness of an object is accompanied by an apparent movement toward the observer, and conversely a decrease in brightness produces an apparent movement in the opposite direction.

H. A. Carr's report on optical illusions of distance, motion and movement is discussed.

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About This Book Preface Chap 1, Introduction Chap 2, The Eye Chap 3, Vision Chap 4, Geometrical Chap 5, Figures Chap 6, Angles Chap 7, Depth/Distance Chap 8 Brightness/Contrast Chap 9, Color Chap 10, Lighting Chap 11, Nature Chap 12, Painting/Decorating Chap 13, Architecture Chap 14, Magic Mirror Chap 15, Camouflage

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