questionedithistorytranslations

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
flagthe United States
7%
4%
76%
9%
627
flagGermany
5%
12%
76%
5%
55
flagCanada
13%
5%
73%
5%
38
flagthe Philippines
14%
3%
71%
7%
28
flagAustralia
18%
2%
70%
6%
44
flagAustria
0%
20%
70%
10%
10
flagPoland
8%
14%
69%
7%
16434
flagthe United Kingdom
13%
8%
67%
8%
131
flagMalaysia
25%
0%
66%
8%
12
flagRussia
7%
15%
65%
12%
40
flagUkraine
10%
17%
63%
8%
74
flagIndonesia
18%
0%
63%
18%
11
flagIndia
10%
9%
59%
17%
200
flagUnknown
21%
5%
42%
31%
19
flagPakistan
10%
10%
40%
40%
10
flagthe United Arab Emirates
20%
30%
40%
10%
10

Which continent is that?

Australia
Asia
Africa
North America

In what process sky colors (including blue sky and red sun) are created?

iridescence
Rayleigh scattering
mirage
atmospheric refraction

Which of the lines on the right, is the continuation of the black line on the left?

red one
blue one
none of them
both of them

How many dots at the intersections are black?

10%
25%
50%
None