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Which area is brighter?

A

B

Both are the same

It depends on the order of seeing

This is the well known checker shadow illusion, first published in 1995 by Edward H. Adelson, Professor of Vision Science at MIT. The area A appears darker because of its light surrounding. At the same time, area B, surrounded with dark areas, appear lighter.

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Singapore

8%

4%

79%

8%

24

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1%

76%

7%

78

the United States

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5%

74%

9%

731

Canada

12%

8%

73%

4%

49

the Netherlands

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19

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71%

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28

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69%

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18871

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35

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67%

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203

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67%

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28

Russia

6%

12%

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15%

111

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5%

20%

64%

8%

34

Germany

11%

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62%

8%

190

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7%

18%

60%

14%

164

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7%

14%

57%

14%

14

India

12%

9%

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281

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7%

14%

50%

28%

14

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13%

33%

46%

0%

15

Unknown

21%

5%

42%

31%

19

South Africa

46%

7%

38%

7%

13

Which continent is that?

In what process sky colors (including blue sky and red sun) are created?

Rayleigh scattering

atmospheric refraction

Which of the lines on the right, is the continuation of the black line on the left?

How many dots at the intersections are black?