equal squares
53 |
| 14. |
Middle sections of the two lines are equal |
54 |
| 15. |
An effect of contrasting areas (Baldwin’s figure) |
54 |
| 16. |
An illusion of contrast |
55 |
| 17. |
Equal circles which appear unequal due to contrast (Ebbinghaus’ figure) |
56 |
| 18. |
Equal circles appearing unequal owing to contrasting concentric circles |
56 |
| 19. |
Circles influenced by position within an angle |
57 |
| 20. |
Contrasting angles |
57 |
| 21. |
Owing to perspective the right angles appear oblique and vice versa |
58 |
| 22. |
Two equal diagonals which appear unequal |
58 |
| 23. |
Apparent variations in the distance between two parallel lines |
59 |
| 24. |
A striking illusion of perspective |
60 |
| 25. |
Distortion of a square due to superposed lines |
61 |
| 26. |
Distortion of a circle due to superposed lines |
62 |
| 27. |
Illustrating fluctuation of attention |
65 |
| 28. |
The grouping of the circles fluctuates |
66 |
| 29. |
Crossed lines which may be interpreted in two ways |
67 |
| 30. |
Reversible cubes |
68 |
| 31. |
The reversible “open book” (after Mach) |
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