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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

10%

3%

75%

10%

29

the United States

9%

5%

73%

10%

785

the Netherlands

4%

4%

73%

4%

23

Australia

13%

2%

72%

10%

87

Canada

13%

7%

71%

5%

53

Poland

8%

13%

69%

7%

19723

Greece

6%

10%

68%

13%

29

Belarus

7%

10%

67%

12%

40

the United Kingdom

12%

9%

66%

9%

227

Germany

11%

14%

62%

9%

325

Austria

5%

20%

62%

11%

53

Switzerland

11%

18%

62%

3%

27

the Philippines

9%

7%

60%

17%

41

Republic of Ireland

8%

12%

60%

20%

25

Ukraine

8%

18%

59%

13%

218

Russia

8%

16%

59%

13%

181

Kazakhstan

4%

23%

57%

9%

21

India

11%

8%

56%

20%

340

the United Arab Emirates

24%

20%

44%

4%

25

Unknown

21%

5%

42%

31%

19

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Rayleigh scattering

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