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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%

5%

73%

10%

864

Australia

13%

2%

73%

9%

93

Poland

8%

13%

70%

7%

20865

the United Kingdom

11%

8%

67%

9%

278

Canada

11%

8%

67%

7%

68

Greece

6%

9%

65%

15%

32

the Netherlands

6%

13%

65%

3%

29

Switzerland

7%

21%

64%

1%

51

Germany

10%

14%

63%

9%

497

Belarus

8%

18%

63%

8%

61

Austria

5%

16%

61%

17%

93

Republic of Ireland

6%

16%

60%

16%

30

the Philippines

14%

6%

57%

18%

49

India

12%

9%

56%

20%

383

Russia

9%

18%

56%

12%

319

Ukraine

9%

17%

56%

15%

282

Czech Republic

13%

13%

52%

21%

23

Kazakhstan

4%

27%

47%

18%

44

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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detergent vapors

small droplets or ice crystals

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