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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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Answers by country

Singapore

9%

3%

77%

9%

31

the United States

9%

6%

72%

10%

841

Australia

14%

2%

72%

10%

90

the Netherlands

7%

7%

70%

3%

27

Poland

8%

13%

69%

7%

20575

Canada

12%

9%

68%

6%

63

Switzerland

9%

18%

67%

2%

43

the United Kingdom

12%

9%

66%

9%

268

Greece

6%

10%

66%

16%

30

Belarus

7%

16%

65%

9%

55

Germany

10%

15%

62%

9%

457

Austria

5%

15%

61%

16%

89

Republic of Ireland

6%

16%

60%

16%

30

Russia

8%

18%

58%

12%

302

the Philippines

14%

6%

57%

18%

49

India

11%

9%

56%

19%

377

Ukraine

9%

17%

56%

14%

274

Czech Republic

13%

13%

52%

21%

23

Kazakhstan

4%

26%

46%

19%

41

the United Arab Emirates

22%

18%

44%

3%

27

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

Rayleigh scattering

atmospheric refraction

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small droplets or ice crystals

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