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%
848
flagAustralia
14%
2%
72%
9%
91
flagPoland
8%
13%
69%
7%
20688
flagCanada
12%
9%
68%
7%
66
flagthe United Kingdom
12%
9%
67%
9%
270
flagthe Netherlands
7%
10%
67%
3%
28
flagBelarus
7%
16%
66%
8%
56
flagGreece
6%
9%
64%
16%
31
flagSwitzerland
8%
21%
63%
2%
47
flagGermany
10%
15%
62%
9%
465
flagAustria
5%
16%
60%
17%
91
flagRepublic of Ireland
6%
16%
60%
16%
30
flagRussia
9%
18%
57%
12%
311
flagthe Philippines
14%
6%
57%
18%
49
flagIndia
12%
9%
56%
19%
381
flagUkraine
9%
17%
56%
15%
280
flagCzech Republic
13%
13%
52%
21%
23
flagKazakhstan
4%
27%
46%
18%
43
flagthe United Arab Emirates
22%
18%
44%
3%
27