. Our senses series; . Fig. II. in the brightness and clearness of the appearanceof objects are a great help in estimating their dis-tances away. These different appearances of ob-jects give rise to many Illusions which will be dis-cussed later. The third visual aid to our perception ofdistance is the rapidity of motion for differentobjects. The faster an object appears to move 6o THE SENSE OF SIGHT the nearer it is thought to be. This is easilynoticed when viewing the landscape from amoving train. The telegraph poles seem to fly-past with great rapidity, while the more distantobjects have muc
. Our senses series; . Fig. II. in the brightness and clearness of the appearanceof objects are a great help in estimating their dis-tances away. These different appearances of ob-jects give rise to many Illusions which will be dis-cussed later. The third visual aid to our perception ofdistance is the rapidity of motion for differentobjects. The faster an object appears to move 6o THE SENSE OF SIGHT the nearer it is thought to be. This is easilynoticed when viewing the landscape from amoving train. The telegraph poles seem to fly-past with great rapidity, while the more distantobjects have much less apparent motion. Wehave the illusion here that the objects are moving. Fig. 12. past us because we are more used to successiveimages caused by objects moving past us thancaused by our movement past objects, and we haveno sensation of the movement of the train savesensations of jar. We learn by experience that THE OUTER WORLD 6i the apparently fast moving object is near, whilethe apparently slow moving object, although itmay be really moving as rapidly as the apparentlyfaster, is farther away. When we see an auto-mobile on the distant road, apparently barelymoving and yet really going thirty miles an hour,we think it is far away (see Fig. 12), or when we
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