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

A
B
Both are the same
It depends on the order of seeing
answers
flagSingapore
7%
3%
80%
7%
26
flagAustralia
12%
1%
77%
7%
79
flagthe Netherlands
5%
0%
75%
5%
20
flagthe United States
8%
5%
74%
9%
742
flagCanada
12%
8%
73%
4%
49
flagGreece
7%
10%
71%
10%
28
flagPoland
8%
13%
69%
7%
19055
flagthe United Kingdom
11%
9%
67%
8%
211
flagthe Philippines
10%
5%
67%
13%
37
flagBelarus
10%
6%
66%
13%
30
flagFrance
0%
13%
66%
13%
15
flagAustria
5%
23%
64%
7%
39
flagRussia
8%
13%
63%
14%
122
flagGermany
13%
14%
61%
8%
214
flagUkraine
7%
17%
60%
13%
173
flagKazakhstan
6%
13%
60%
13%
15
flagIndia
11%
9%
56%
18%
301
flagSwitzerland
15%
26%
47%
5%
19
flagUnknown
21%
5%
42%
31%
19
flagthe United Arab Emirates
28%
28%
35%
7%
14