Part 22

INDEX

Aberration, 19 spherical, 122 chromatic, 135

Aerial perspective, 165, 183

After-images, 24, 25, 59, 128, 186 positive and negative, 129

Airplanes, visibility of, 233 camouflage for different types, 234 size of image at various altitudes, 238 camouflage for various conditions, 240

Alhazen, 8

Angles, influence of, 76 various effects of, 81 contours and, 87 apparent effect on length, 91 theories, 98

Animals, protective coloration, 211

Architecture, 195 balance in, 201

Arcs, circular, illusions due to, 86

Areas, juxtaposed, illusions of, 96

Artist, 179

Attention, fluctuation of, 65, 106, 141, 164

Aubert, 49

Auerbach's indirect vision theory, 100

Aureole, 178

Balance in architecture, 201

Bas-relief, 143

Battleships, 222

Binocular disparity, 105

Binocular vision, 29, 31

Blending of colors in camouflage, 216

Blind spot, 21

Blue light on war-vessels, 230

Boswell, varieties of irradiation, 122

Brightness, illusions due to variations in, 107 and color contrasts, 114 apparatus, 115 and hue, 125 sky, 241

Brucke's theory, 37

Brunot's mean distance theory, 101