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
flagDenmark
0%
17%
78%
4%
23
flagthe United States
5%
6%
77%
9%
787
flagItaly
6%
10%
76%
6%
30
flagUnknown
7%
10%
74%
6%
1081
flagCanada
12%
6%
73%
8%
49
flagNorway
6%
13%
72%
4%
43
flagPoland
8%
13%
71%
6%
16832
flagGermany
6%
13%
71%
7%
188
flagthe United Kingdom
10%
10%
70%
7%
420
flagSpain
11%
14%
70%
3%
27
flagSweden
11%
3%
69%
15%
26
flagRussia
4%
21%
66%
7%
42
flagIndia
8%
7%
64%
15%
202
flagthe Netherlands
10%
13%
63%
10%
60
flagAustralia
17%
6%
62%
11%
45
flagthe Philippines
21%
8%
60%
8%
23
flagFrance
14%
16%
58%
6%
48
flagCzech Republic
15%
21%
57%
5%
19
flagUkraine
11%
25%
55%
7%
27
flagRepublic of Ireland
17%
8%
52%
19%
46

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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