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.
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Answers by country

A
B
C
All are the same
answers
flagFrance
0%
0%
0%
100%
14
flagMalaysia
0%
5%
0%
94%
18
flagthe Netherlands
0%
4%
0%
90%
22
flagAustria
0%
10%
0%
89%
29
flagAustralia
2%
9%
1%
86%
73
flagPoland
3%
8%
1%
85%
20959
flagIndonesia
7%
0%
7%
85%
14
flagthe United States
6%
9%
2%
80%
824
flagthe United Kingdom
3%
10%
3%
80%
204
flagSwitzerland
0%
9%
0%
80%
21
flagSingapore
0%
9%
4%
80%
21
flagGermany
3%
15%
2%
78%
187
flagCanada
1%
16%
1%
78%
61
flagGreece
5%
11%
0%
77%
18
flagPakistan
6%
6%
12%
75%
16
flagIndia
12%
13%
2%
68%
307
flagUnknown
13%
10%
3%
68%
29
flagthe United Arab Emirates
16%
16%
0%
68%
25
flagRepublic of Ireland
6%
13%
20%
60%
15
flagthe Philippines
28%
19%
2%
47%
42