Which line is the longest?

A
B
C
All are the same
This illusion has a long research history. It seems that people living in ur­ban­ized areas perceive the lines as rep­re­sent­ing the corners of rec­ti­lin­ear objects viewed in per­spec­tive, being more sus­cep­ti­ble to illusion than people from rural areas.

Answers distribution

A
B
C
All are the same
answers
flagItaly
2%
5%
0%
92%
39
flagthe United Arab Emirates
3%
3%
0%
90%
32
flagFinland
0%
9%
0%
90%
21
flagCroatia
0%
10%
0%
89%
19
flagSwitzerland
0%
5%
0%
88%
18
flagNorway
0%
10%
0%
87%
39
flagPoland
2%
8%
1%
86%
17715
flagUnknown
4%
6%
1%
86%
1249
flagthe Netherlands
0%
11%
1%
86%
53
flagFrance
0%
8%
4%
86%
50
flagSpain
4%
8%
0%
86%
23
flagthe United States
4%
6%
2%
85%
882
flagthe United Kingdom
3%
9%
1%
85%
485
flagAustralia
2%
11%
2%
83%
43
flagCanada
1%
15%
0%
82%
63
flagGermany
3%
10%
3%
80%
217
flagRepublic of Ireland
5%
15%
1%
75%
57
flagIndia
10%
10%
2%
72%
201
flagDenmark
4%
25%
4%
66%
24
flagthe Philippines
26%
10%
6%
53%
30

Gender

men87%
women89%
A
3%
1%
B
6%
7%
C
1%
1%
All are the same
87%
89%

Language versions

question
answers
results
flag
Which line is the longest?
1739
81%

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