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
flagUU
0%
0%
0%
100%
21
flagthe United Arab Emirates
0%
0%
0%
94%
17
flagMalaysia
0%
6%
0%
93%
16
flagNorway
0%
11%
0%
88%
27
flagItaly
3%
7%
0%
88%
26
flagSpain
5%
5%
0%
88%
18
flagFrance
0%
7%
2%
87%
39
flagFinland
0%
12%
0%
87%
16
flagPakistan
6%
6%
0%
87%
16
flagthe Netherlands
0%
10%
2%
86%
38
flagPoland
2%
9%
1%
85%
11335
flagthe United States
4%
6%
2%
85%
809
flagGermany
2%
8%
3%
84%
150
flagthe United Kingdom
3%
10%
1%
83%
355
flagAustralia
2%
13%
2%
81%
37
flagCanada
1%
18%
0%
79%
53
flagIndia
10%
11%
3%
71%
184
flagRepublic of Ireland
4%
19%
2%
71%
46
flagDenmark
5%
22%
5%
66%
18
flagthe Philippines
22%
7%
7%
59%
27

Gender

men88%
women89%
A
3%
1%
B
6%
8%
C
1%
1%
All are the same
88%
89%

Language versions

question
answers
results
flag
Which line is the longest?
1550
81%

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