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
flagUnknown
3%
3%
0%
92%
54
flagthe United Arab Emirates
0%
4%
0%
92%
25
flagSpain
5%
5%
0%
90%
20
flagItaly
3%
7%
0%
89%
28
flagFrance
0%
7%
2%
88%
42
flagFinland
0%
11%
0%
88%
18
flagCzech Republic
0%
11%
0%
88%
17
flagthe Netherlands
0%
9%
2%
87%
41
flagPakistan
6%
6%
0%
87%
16
flagPoland
2%
9%
1%
85%
12136
flagthe United States
4%
6%
2%
85%
844
flagNorway
0%
14%
0%
85%
28
flagthe United Kingdom
3%
10%
1%
84%
383
flagGermany
2%
8%
3%
83%
170
flagAustralia
2%
13%
2%
81%
37
flagCanada
1%
17%
0%
80%
56
flagRepublic of Ireland
5%
17%
1%
72%
51
flagIndia
10%
11%
3%
71%
195
flagDenmark
4%
23%
4%
66%
21
flagthe Philippines
27%
6%
6%
55%
29

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?
1618
81%

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