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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

Australia

13%

2%

73%

9%

93

the United States

9%

5%

72%

10%

858

Poland

8%

13%

69%

7%

20843

the United Kingdom

12%

9%

67%

9%

272

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%

492

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%

318

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

Which continent is that?

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

How many dots at the intersections are black?