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
7%
7%
81%
3%
27
flagDenmark
0%
17%
78%
4%
23
flagthe United States
5%
6%
77%
8%
769
flagCroatia
5%
11%
77%
5%
18
flagUnknown
7%
10%
75%
6%
996
flagCanada
10%
6%
75%
8%
48
flagNorway
7%
14%
73%
4%
41
flagGermany
7%
11%
72%
8%
171
flagPoland
8%
13%
71%
6%
15519
flagthe United Kingdom
10%
10%
70%
7%
401
flagSpain
11%
14%
70%
3%
27
flagSweden
15%
0%
70%
15%
20
flagIndia
9%
8%
65%
13%
187
flagthe Netherlands
6%
17%
65%
8%
47
flagAustralia
19%
4%
64%
9%
42
flagRussia
3%
23%
63%
10%
30
flagFrance
13%
17%
60%
4%
46
flagthe Philippines
21%
8%
60%
8%
23
flagRepublic of Ireland
15%
9%
54%
18%
44
flagUkraine
9%
27%
54%
9%
22

Gender

men73%
women74%
A
8%
7%
B
11%
12%
Both are the same
73%
74%
It depends on the order of seeing
6%
5%

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