The principles of psychology . normal size. A man moving towards usis not sensibly perceived to groiv, for example; and myfinger, of which a single joint may more than conceal himfrom my view, is nevertheless seen as a much smaller objectthan the man. As for distances, it is often possible to makethe farther part of an object seem near and the nearer partfar. A human profile in intaglio, looked at steadily withone eye, or even both, soon appears irresistibly as a bas-relief. The inside of a common pasteboard mask, paintedlike the outside, and viewed with one eye in a direct light,also looks co
The principles of psychology . normal size. A man moving towards usis not sensibly perceived to groiv, for example; and myfinger, of which a single joint may more than conceal himfrom my view, is nevertheless seen as a much smaller objectthan the man. As for distances, it is often possible to makethe farther part of an object seem near and the nearer partfar. A human profile in intaglio, looked at steadily withone eye, or even both, soon appears irresistibly as a bas-relief. The inside of a common pasteboard mask, paintedlike the outside, and viewed with one eye in a direct light,also looks convex instead of hollow. So strong is the illu- * Physiologische Uutersuchuugen im Gebiete der Optik, v. THE PERCEPTION OF SPACE. 255 sion, after long fixation, that a friend wlio painted such amask for me told me it soon became difficult to see how toapply the brush. Bend a visiting-card across the middle,so that its halves form an angle of 90° more or less; set itupright on the table, as in Fig, 72, and view it with one 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
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpsychology, bookyear1
