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%
777
flagthe Netherlands
4%
4%
73%
4%
23
flagAustralia
14%
1%
72%
10%
84
flagCanada
13%
7%
71%
5%
53
flagPoland
8%
13%
69%
7%
19573
flagBelarus
7%
7%
69%
12%
39
flagGreece
6%
10%
68%
13%
29
flagthe Philippines
10%
5%
67%
13%
37
flagthe United Kingdom
12%
9%
66%
9%
224
flagAustria
6%
19%
65%
8%
47
flagGermany
12%
13%
62%
9%
291
flagSwitzerland
11%
19%
61%
3%
26
flagRussia
8%
15%
60%
14%
161
flagRepublic of Ireland
8%
12%
60%
20%
25
flagUkraine
8%
19%
59%
12%
206
flagIndia
12%
9%
56%
19%
319
flagCzech Republic
5%
17%
52%
23%
17
flagUnknown
21%
5%
42%
31%
19
flagthe United Arab Emirates
25%
25%
37%
6%
16