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%
730
flagIndonesia
17%
0%
76%
5%
17
flagDenmark
0%
20%
75%
5%
20
flagCanada
11%
6%
74%
6%
43
flagthe United Kingdom
10%
10%
71%
7%
353
flagGermany
6%
13%
70%
9%
129
flagPoland
8%
14%
69%
6%
10918
flagNorway
9%
15%
68%
6%
32
flagIndia
8%
6%
67%
14%
174
flagSpain
12%
16%
66%
4%
24
flagRussia
4%
20%
66%
8%
24
flagUnknown
7%
11%
65%
11%
26
flagFrance
10%
17%
64%
2%
39
flagthe Netherlands
5%
21%
63%
7%
38
flagAustralia
21%
5%
60%
10%
38
flagthe Philippines
21%
8%
60%
8%
23
flagPakistan
13%
13%
60%
13%
15
flagthe United Arab Emirates
6%
37%
56%
0%
16
flagRepublic of Ireland
17%
10%
55%
15%
40

Gender

men69%
women71%
A
10%
8%
B
12%
13%
Both are the same
69%
71%
It depends on the order of seeing
7%
5%

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