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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%

76%

10%

30

the Netherlands

4%

4%

75%

4%

24

the United States

9%

5%

73%

10%

807

Australia

14%

2%

71%

10%

88

Canada

11%

6%

71%

6%

60

Poland

8%

13%

70%

7%

20082

Switzerland

9%

15%

68%

3%

32

the United Kingdom

12%

8%

67%

10%

240

Greece

6%

10%

66%

16%

30

Belarus

8%

13%

64%

11%

45

Austria

5%

16%

63%

15%

79

Germany

10%

15%

61%

9%

396

Russia

8%

15%

59%

13%

236

Republic of Ireland

7%

14%

59%

18%

27

Ukraine

9%

18%

58%

13%

232

Kazakhstan

4%

25%

58%

8%

24

India

11%

8%

56%

20%

351

the Philippines

13%

6%

56%

18%

44

the United Arab Emirates

24%

20%

44%

4%

25

Unknown

21%

5%

42%

31%

19

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