. Psychology in daily life. Fig. 15. Fig. 16 LAW IN ILLUSION turning the page so as to look at the patterns fromthe side. In Fig. 8a the twisted cord seems to form a con-tinuous spiral, but it really forms a series of con-centric circles of which 8b is an exact outline. Toverify this apply a pair of dividers and trace thecircles.^ In Fig. 9 the rings of twisted cords are againperfect circles, which may be proved as in the fore-going figure, but they appear to be quite , the rings in Figs. lo, ii, 12, and 13 areperfect circles, although their appearance is verydifferent. The r
. Psychology in daily life. Fig. 15. Fig. 16 LAW IN ILLUSION turning the page so as to look at the patterns fromthe side. In Fig. 8a the twisted cord seems to form a con-tinuous spiral, but it really forms a series of con-centric circles of which 8b is an exact outline. Toverify this apply a pair of dividers and trace thecircles.^ In Fig. 9 the rings of twisted cords are againperfect circles, which may be proved as in the fore-going figure, but they appear to be quite , the rings in Figs. lo, ii, 12, and 13 areperfect circles, although their appearance is verydifferent. The radiating spokes in Fig. 14 are uniformlyspaced at the hub, but they seem to enter bypairs as wedges. The vertical lines in Fig. 15 arestraight and parallel, but they seem to be decidedlybent. The same is true of the columns in Fig. 17,which would not prove a very restful pattern for afireplace tile.^ The columns, although straight andmade up of perfect parallelograms, seem to topple. This illusion has been called the Unit of Di- * A
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectpsychology, bookyear1
