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
10%
3%
78%
7%
28
flagthe United States
9%
5%
73%
10%
779
flagthe Netherlands
4%
4%
73%
4%
23
flagAustralia
14%
1%
72%
10%
84
flagCanada
13%
7%
71%
5%
53
flagPoland
8%
13%
69%
7%
19644
flagBelarus
7%
7%
69%
12%
39
flagGreece
6%
10%
68%
13%
29
flagthe United Kingdom
12%
9%
67%
9%
225
flagAustria
6%
18%
66%
8%
48
flagthe Philippines
10%
5%
65%
13%
38
flagGermany
11%
14%
62%
10%
308
flagSwitzerland
11%
19%
61%
3%
26
flagRussia
7%
15%
60%
14%
165
flagRepublic of Ireland
8%
12%
60%
20%
25
flagUkraine
8%
19%
59%
12%
208
flagIndia
11%
8%
56%
20%
330
flagCzech Republic
5%
17%
52%
23%
17
flagUnknown
21%
5%
42%
31%
19
flagthe United Arab Emirates
25%
25%
37%
6%
16