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.

Answers distribution

A
B
Both are the same
It depends on the order of seeing
answers
flagItaly
8%
8%
80%
4%
25
flagthe United States
5%
6%
77%
9%
737
flagDenmark
0%
19%
76%
4%
21
flagIndonesia
17%
0%
76%
5%
17
flagCanada
11%
6%
74%
6%
43
flagthe United Kingdom
10%
10%
70%
7%
357
flagGermany
6%
12%
70%
9%
133
flagPoland
8%
14%
69%
6%
11139
flagSpain
11%
15%
69%
3%
26
flagNorway
9%
15%
68%
6%
32
flagRussia
4%
20%
68%
8%
25
flagIndia
8%
7%
66%
14%
179
flagUnknown
12%
10%
64%
10%
39
flagFrance
10%
17%
64%
2%
39
flagthe Netherlands
5%
20%
62%
10%
40
flagAustralia
21%
5%
60%
10%
38
flagthe Philippines
21%
8%
60%
8%
23
flagthe United Arab Emirates
5%
35%
58%
0%
17
flagRepublic of Ireland
16%
9%
54%
16%
42
flagCzech Republic
18%
25%
50%
6%
16

Gender

men69%
women71%
A
10%
8%
B
12%
13%
Both are the same
69%
72%
It depends on the order of seeing
7%
5%

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