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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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the Netherlands

0%

0%

76%

7%

13

the United States

8%

5%

74%

9%

699

Australia

14%

1%

74%

7%

67

Canada

12%

6%

74%

4%

47

the Philippines

13%

3%

73%

6%

30

Belarus

8%

8%

73%

8%

23

Germany

9%

11%

70%

6%

131

Poland

8%

13%

69%

7%

18174

Malaysia

23%

0%

69%

7%

13

the United Kingdom

12%

10%

68%

6%

177

Greece

8%

12%

68%

12%

25

Austria

4%

21%

65%

8%

23

Russia

6%

15%

61%

15%

91

Ukraine

7%

18%

60%

13%

134

Kazakhstan

8%

16%

58%

8%

12

India

12%

9%

55%

18%

259

Switzerland

7%

30%

53%

0%

13

South Africa

54%

0%

45%

0%

11

Unknown

21%

5%

42%

31%

19

the United Arab Emirates

27%

27%

36%

9%

11

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?