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
9%
3%
77%
9%
31
flagthe United States
9%
6%
72%
10%
842
flagAustralia
14%
2%
72%
10%
90
flagPoland
8%
13%
69%
7%
20646
flagCanada
12%
9%
67%
7%
65
flagthe Netherlands
7%
10%
67%
3%
28
flagthe United Kingdom
12%
9%
66%
9%
269
flagGreece
6%
10%
66%
16%
30
flagBelarus
7%
16%
65%
9%
55
flagSwitzerland
8%
21%
63%
2%
46
flagGermany
10%
15%
62%
9%
465
flagAustria
5%
15%
61%
17%
90
flagRepublic of Ireland
6%
16%
60%
16%
30
flagRussia
9%
17%
57%
12%
309
flagthe Philippines
14%
6%
57%
18%
49
flagIndia
12%
9%
56%
19%
379
flagUkraine
9%
17%
56%
15%
279
flagCzech Republic
13%
13%
52%
21%
23
flagKazakhstan
4%
26%
46%
19%
41
flagthe United Arab Emirates
22%
18%
44%
3%
27