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.

Answers distribution

A
B
Both are the same
It depends on the order of seeing
answers
flagItaly
7%
7%
78%
7%
28
flagDenmark
0%
17%
78%
4%
23
flagthe United States
6%
6%
77%
9%
774
flagUnknown
7%
10%
75%
6%
1032
flagCanada
10%
6%
75%
8%
48
flagSweden
12%
0%
75%
12%
24
flagNorway
7%
14%
73%
4%
42
flagPoland
8%
13%
71%
6%
16207
flagGermany
7%
12%
71%
8%
180
flagthe United Kingdom
10%
10%
70%
7%
409
flagSpain
11%
14%
70%
3%
27
flagIndia
8%
8%
64%
14%
195
flagAustralia
18%
4%
63%
11%
44
flagthe Netherlands
11%
14%
62%
7%
54
flagRussia
2%
26%
61%
8%
34
flagthe Philippines
21%
8%
60%
8%
23
flagFrance
12%
17%
59%
6%
47
flagUkraine
8%
26%
56%
8%
23
flagRepublic of Ireland
15%
9%
54%
18%
44
flagBelgium
15%
26%
47%
5%
19

Gender

men73%
women74%
A
8%
7%
B
10%
12%
Both are the same
73%
74%
It depends on the order of seeing
6%
5%

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