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%
15
flagMalaysia
0%
5%
0%
95%
20
flagthe Netherlands
0%
8%
0%
88%
25
flagIndonesia
6%
0%
6%
87%
16
flagAustralia
2%
9%
1%
86%
74
flagAustria
1%
11%
0%
86%
51
flagPoland
3%
8%
1%
85%
21465
flagGermany
2%
12%
2%
81%
290
flagthe United Kingdom
3%
10%
3%
81%
222
flagthe United States
6%
9%
2%
80%
861
flagSingapore
0%
9%
4%
80%
21
flagSwitzerland
0%
9%
6%
78%
32
flagCanada
2%
14%
2%
77%
68
flagGreece
5%
11%
0%
77%
18
flagPakistan
5%
11%
11%
70%
17
flagIndia
12%
13%
2%
68%
329
flagUnknown
13%
10%
3%
68%
29
flagthe United Arab Emirates
14%
17%
0%
60%
28
flagRepublic of Ireland
6%
18%
18%
56%
16
flagthe Philippines
27%
18%
2%
50%
44