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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%

78%

7%

28

the United States

9%

5%

73%

10%

779

the Netherlands

4%

4%

73%

4%

23

Australia

14%

1%

72%

10%

84

Canada

13%

7%

71%

5%

53

Poland

8%

13%

69%

7%

19644

Belarus

7%

7%

69%

12%

39

Greece

6%

10%

68%

13%

29

the United Kingdom

12%

9%

67%

9%

225

Austria

6%

18%

66%

8%

48

the Philippines

10%

5%

65%

13%

38

Germany

11%

14%

62%

10%

308

Switzerland

11%

19%

61%

3%

26

Russia

7%

15%

60%

14%

165

Republic of Ireland

8%

12%

60%

20%

25

Ukraine

8%

19%

59%

12%

208

India

11%

8%

56%

20%

330

Czech Republic

5%

17%

52%

23%

17

Unknown

21%

5%

42%

31%

19

the United Arab Emirates

25%

25%

37%

6%

16

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?