Fact and fable in psychology . r surfaces. If we view outlines only, with-out shading or perspective or anything to definitelysuggest what is foreground and what background, it THE MINDS EYE 287 becomes possible for the mind to supply these detailsand see foreground as background, and vice versa. A good example to begin with is Fig. 7. These out-lines will probably suggest at first view a book, or bet-ter a book-cover, seen with its back toward you andits sides sloping away from you ; but it may also beviewed as a book opened out towards you and present-ing to you an inside view of its content
Fact and fable in psychology . r surfaces. If we view outlines only, with-out shading or perspective or anything to definitelysuggest what is foreground and what background, it THE MINDS EYE 287 becomes possible for the mind to supply these detailsand see foreground as background, and vice versa. A good example to begin with is Fig. 7. These out-lines will probably suggest at first view a book, or bet-ter a book-cover, seen with its back toward you andits sides sloping away from you ; but it may also beviewed as a book opened out towards you and present-ing to you an inside view of its contents. Should thechange not come readily, it may be facilitated bythinking persistently of the appearance of an openbook in this position. The upper portion of Fig. 8 ispractically the same as Fig. 7, and if the rest of thefigure be covered up, it will change as did the bookcover; when, however, the whole figure is viewed as anarrow, a new conception enters, and the apparentlysolid book cover becomes the Jlat feathered part of the. Fig. 9. —The smaller square may be regarded as either the nearer faceof a projecting figure or as the more distant face of a hollow figure. arrow. Look at the next figure (Fig. 9), which repre-sents in outline a truncated pyramid with a square base. 288 FACT AND FABLE IN PSYCHOLOGY Is the smaller square nearer to you, and are the sidesof the pyramid sloping away from you toward thelarger square in the rear ? Or are you looking intothe hollow of a truncated j)yramid with the smallersquare in the background ? Or is it now one and nowthe other, according as you decide to see it ? Here
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