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%
76%
9%
721
flagIndonesia
17%
0%
76%
5%
17
flagDenmark
0%
20%
75%
5%
20
flagCanada
11%
7%
73%
7%
42
flagthe United Kingdom
9%
10%
71%
6%
332
flagGermany
6%
14%
69%
9%
121
flagPoland
8%
14%
68%
6%
10678
flagIndia
7%
6%
68%
14%
164
flagNorway
9%
15%
68%
6%
32
flagSpain
12%
16%
66%
4%
24
flagRussia
4%
22%
63%
9%
22
flagthe Netherlands
5%
22%
61%
8%
36
flagAustralia
21%
5%
60%
10%
38
flagFrance
11%
20%
60%
2%
35
flagMalaysia
20%
0%
60%
20%
15
flagthe Philippines
22%
9%
59%
9%
22
flagUU
6%
12%
56%
18%
16
flagRepublic of Ireland
17%
10%
53%
15%
39
flagBelgium
13%
33%
40%
6%
15

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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