The principles of psychology . Fig. 72. You can make it appear either as if it opened towards youor away from you. In the former case, the angle ab lies. upon the table, b being nearer to you than a; in the latter case ab seems vertical to the table—as indeed it really is— with a nearer to you than 6.* Again, look,with either one or * Cf. E. Mach, Beitrage zur Analyse der Empfinduugen, p. 87. 256 PSYCHOLOGY. two eyes, at the opening of a wine-glass or tumbler (), held either above or below the eyes level. The retinalimage of the opening is an oval, but we can see the oval ineither of two
The principles of psychology . Fig. 72. You can make it appear either as if it opened towards youor away from you. In the former case, the angle ab lies. upon the table, b being nearer to you than a; in the latter case ab seems vertical to the table—as indeed it really is— with a nearer to you than 6.* Again, look,with either one or * Cf. E. Mach, Beitrage zur Analyse der Empfinduugen, p. 87. 256 PSYCHOLOGY. two eyes, at the opening of a wine-glass or tumbler (), held either above or below the eyes level. The retinalimage of the opening is an oval, but we can see the oval ineither of two ways,—as if it were the perspective view of acircle whose edge h were farther from us than its edge a(in which case we should seem to be looking down on thecircle), or as if its edge a were the more distant edge (inwhich case we should be looking up at it through the h sideof the glass). As the manner of seeing the edge changes,the glass itself alters its form in space and looks straightor seems bent towards or from the eye,* according as thelatter is placed beneath or above it. Plane diagrams also can be conceived as solids, and thatin mor
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpsychology, bookyear1
