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%
4%
0%
92%
42
flagthe United Arab Emirates
2%
2%
0%
91%
35
flagFinland
0%
9%
0%
90%
21
flagSweden
4%
0%
4%
90%
21
flagthe Netherlands
0%
9%
1%
88%
63
flagNorway
0%
9%
0%
88%
42
flagPoland
2%
8%
1%
86%
19002
flagUnknown
4%
6%
1%
86%
1356
flagFrance
0%
7%
3%
86%
51
flagSpain
4%
8%
0%
86%
23
flagSwitzerland
0%
9%
0%
86%
22
flagthe United States
4%
6%
2%
85%
889
flagAustralia
2%
10%
2%
85%
47
flagthe United Kingdom
3%
9%
1%
84%
513
flagCanada
1%
15%
0%
82%
64
flagGermany
3%
10%
3%
80%
242
flagRepublic of Ireland
5%
15%
1%
75%
58
flagIndia
10%
11%
2%
71%
210
flagDenmark
4%
24%
4%
68%
25
flagthe Philippines
28%
12%
6%
50%
32

Gender

men88%
women90%
A
3%
1%
B
6%
7%
C
1%
1%
All are the same
88%
90%

Language versions

question
answers
results
flag
Which line is the longest?
1774
81%

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