Chapter 4 - Types of Geometrical Optical Illusions:Illusions of ContourGo where you feel most like yourself. - Paul Witt
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Chapter 4 - Types of Geometrical Optical Illusions:
Illusions of Interrupted Extent
1   2   3   4   5   Chapter 4 - Types of Geometrical Optical Illusions:
Illusions of Contrast

Chapter 4 - Types of Geometrical Optical Illusions:
Illusions of Contour

Illusions of Contour. - The optical illusions of this type, or exhibiting this influence, are quite numerous. In Fig. 11 there are two semicircles, one closed by a diameter, the other unclosed. The unclosed one appears a little flatter and with a slightly larger radius than the one that is closed.

Chapter 4 - Types of Geometrical Optical Illusions:Illusions of Contour
Fig. 11. - Two equal semicircles.

Similarly in Fig. 12 the shorter portion of the interrupted circumference of a circle appears flatter and of greater radius of curvature than the greater portions.

Chapter 4 - Types of Geometrical Optical Illusions:Illusions of Contour
Fig. 12. - Arcs of the same circle.

In Fig.13 the length of the middle space and of the open-sided squares are equal. In fact there are two uncompleted squares and an empty "square" between, the three of which are of equal dimensions. However the middle space appears slightly too high and narrow; the other two appear slightly too low and broad. These figures are related to the well-known Muller-Lyer optical illusion illustrated in Fig. 56.

Chapter 4 - Types of Geometrical Optical Illusions:Illusions of Contour
Fig. 13. - Three incomplete but equal squares.

Some of the optical illusions presented later will be seen to involve the influence of contour. Examples of these are Figs. 55 and Fig 60. In the former, the horizontal base line appears to sag; in the latter, the areas appear unequal, but they are equal.



Chapter 4 - Types of Geometrical Optical Illusions:
Illusions of Interrupted Extent
1   2   3   4   5   Chapter 4 - Types of Geometrical Optical Illusions:
Illusions of Contrast

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About This Book Preface Chap 1, Introduction Chap 2, The Eye Chap 3, Vision Chap 4, Geometrical Chap 5, Figures Chap 6, Angles Chap 7, Depth/Distance Chap 8 Brightness/Contrast Chap 9, Color Chap 10, Lighting Chap 11, Nature Chap 12, Painting/Decorating Chap 13, Architecture Chap 14, Magic Mirror Chap 15, Camouflage

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