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
flagAustralia
13%
1%
77%
6%
76
flagthe United States
8%
5%
74%
9%
723
flagCanada
12%
8%
72%
4%
48
flagthe Netherlands
5%
0%
72%
5%
18
flagGreece
7%
10%
71%
10%
28
flagthe Philippines
12%
3%
70%
9%
31
flagBelarus
7%
7%
70%
11%
27
flagPoland
8%
13%
69%
7%
18712
flagMalaysia
23%
0%
69%
7%
13
flagthe United Kingdom
12%
9%
67%
8%
198
flagGermany
9%
14%
66%
7%
164
flagRussia
6%
13%
63%
15%
105
flagAustria
6%
21%
63%
9%
33
flagUkraine
7%
18%
58%
14%
158
flagKazakhstan
7%
14%
57%
14%
14
flagIndia
12%
9%
56%
18%
272
flagCzech Republic
7%
14%
50%
28%
14
flagSwitzerland
13%
33%
46%
0%
15
flagUnknown
21%
5%
42%
31%
19
flagSouth Africa
46%
7%
38%
7%
13