The principles of psychology . ch. liberdas Schielen, Berlin, 1881 ; by Javal, Annales dOculistique, 217), because the facts are exceptional at best and very difficult of inter-pretation. In favor of the sensationalistic or nativistic view of one suchcase, see the important paper by Von Kries, Archiv f. Ophthalm., , p. 117. 254 PSYCHOLOGY. The phenomena of the first group were described onpage 232. A. W. Yolkmann has studied them with hisaccustomed clearness and care. * Even an imaginarilyinclined wall, in a picture, will, if an after-image be thrownupon it, distort the shape th
The principles of psychology . ch. liberdas Schielen, Berlin, 1881 ; by Javal, Annales dOculistique, 217), because the facts are exceptional at best and very difficult of inter-pretation. In favor of the sensationalistic or nativistic view of one suchcase, see the important paper by Von Kries, Archiv f. Ophthalm., , p. 117. 254 PSYCHOLOGY. The phenomena of the first group were described onpage 232. A. W. Yolkmann has studied them with hisaccustomed clearness and care. * Even an imaginarilyinclined wall, in a picture, will, if an after-image be thrownupon it, distort the shape thereof, and make us see a formof which our after-image would be the natural projectionon the retina, were that form laid upon the wall. Thus asignboard is painted in perspective on a screen, and theeye, after steadily looking at a rectangular cross, is turnedto the painted signboard. The after-image appears as anoblique-legged cross upon the signboard. It is the conversephenomenon of a perspective drawing like Fig. 71, in which. Fig. 71. really figures are seen as rectangular unstable judgments of relative distance and sizewere also mentioned on pp. 231-2. Whatever the size maybe of the retinal image which an object makes, the object isseen as of its own 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, af
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