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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%
8%
75%
13%
36
flagGreece
0%
16%
73%
9%
42
flagPoland
2%
18%
66%
11%
31320
flagthe Netherlands
0%
15%
65%
17%
40
flagSwitzerland
3%
14%
62%
20%
64
flagGermany
4%
15%
61%
18%
596
flagthe United Kingdom
4%
15%
61%
18%
355
flagCanada
7%
16%
60%
13%
83
flagSingapore
2%
15%
58%
23%
39
flagAustralia
2%
12%
56%
26%
102
flagthe United States
5%
19%
55%
19%
1075
flagAustria
3%
14%
55%
26%
78
flagBelarus
3%
18%
51%
27%
33
flagRussia
5%
16%
50%
25%
176
flagUnknown
9%
26%
50%
14%
42
flagRepublic of Ireland
8%
17%
50%
20%
34
flagthe Philippines
6%
22%
48%
22%
72
flagUkraine
3%
15%
47%
30%
194
flagIndia
10%
26%
35%
26%
468
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