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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

Australia

13%

1%

77%

6%

76

the United States

8%

5%

74%

9%

723

Canada

12%

8%

72%

4%

48

the Netherlands

5%

0%

72%

5%

18

Greece

7%

10%

71%

10%

28

the Philippines

12%

3%

70%

9%

31

Belarus

7%

7%

70%

11%

27

Poland

8%

13%

69%

7%

18712

Malaysia

23%

0%

69%

7%

13

the United Kingdom

12%

9%

67%

8%

198

Germany

9%

14%

66%

7%

164

Russia

6%

13%

63%

15%

105

Austria

6%

21%

63%

9%

33

Ukraine

7%

18%

58%

14%

158

Kazakhstan

7%

14%

57%

14%

14

India

12%

9%

56%

18%

272

Czech Republic

7%

14%

50%

28%

14

Switzerland

13%

33%

46%

0%

15

Unknown

21%

5%

42%

31%

19

South Africa

46%

7%

38%

7%

13

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?