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%
75%
10%
29
flagthe United States
9%
5%
73%
10%
785
flagthe Netherlands
4%
4%
73%
4%
23
flagAustralia
13%
2%
72%
10%
87
flagCanada
13%
7%
71%
5%
53
flagPoland
8%
13%
69%
7%
19723
flagGreece
6%
10%
68%
13%
29
flagBelarus
7%
10%
67%
12%
40
flagthe United Kingdom
12%
9%
66%
9%
227
flagGermany
11%
14%
62%
9%
325
flagAustria
5%
20%
62%
11%
53
flagSwitzerland
11%
18%
62%
3%
27
flagthe Philippines
9%
7%
60%
17%
41
flagRepublic of Ireland
8%
12%
60%
20%
25
flagUkraine
8%
18%
59%
13%
218
flagRussia
8%
16%
59%
13%
181
flagKazakhstan
4%
23%
57%
9%
21
flagIndia
11%
8%
56%
20%
340
flagthe United Arab Emirates
24%
20%
44%
4%
25
flagUnknown
21%
5%
42%
31%
19