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Which shape is larger?

A
B
None of them
Both are larger
Both shapes are the same, but the bottom one is placed more to the right. This is however difficult to notice. It is known as Jastrow Illusion.
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Answers by country

A
B
None of them
Both are larger
answers
flagFrance
2%
5%
77%
14%
35
flagGreece
0%
17%
71%
10%
39
flagPoland
2%
18%
66%
11%
31132
flagSwitzerland
3%
13%
63%
20%
60
flagthe Netherlands
0%
15%
63%
18%
38
flagthe United Kingdom
4%
15%
61%
17%
341
flagGermany
4%
15%
60%
19%
564
flagCanada
7%
17%
60%
13%
82
flagSingapore
2%
15%
58%
23%
39
flagAustralia
3%
13%
57%
25%
98
flagthe United States
5%
19%
54%
19%
1042
flagAustria
4%
13%
54%
28%
75
flagBelarus
3%
18%
51%
27%
33
flagRussia
5%
16%
50%
26%
172
flagUnknown
9%
26%
50%
14%
42
flagRepublic of Ireland
8%
17%
50%
20%
34
flagUkraine
3%
16%
48%
30%
193
flagthe Philippines
6%
22%
48%
22%
72
flagIndia
10%
26%
35%
26%
464
flagthe United Arab Emirates
6%
32%
12%
45%
31

Which area is brighter?

A
B
Both are the same
It depends on the order of seeing

How many dots at the intersections are black?

10%
25%
50%
None

Which continent is that?

Australia
Asia
Africa
North America

Which line is the longest?

A
B
C
All are the same