questionedithistorytranslations

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
flagAustria
1%
10%
0%
87%
56
flagIndonesia
6%
0%
6%
87%
16
flagthe Netherlands
0%
6%
3%
86%
29
flagPoland
3%
8%
1%
85%
21624
flagAustralia
2%
10%
1%
85%
77
flagthe United States
5%
8%
2%
81%
901
flagthe United Kingdom
3%
10%
3%
81%
233
flagGermany
2%
13%
2%
80%
365
flagSwitzerland
0%
8%
5%
80%
36
flagGreece
4%
9%
0%
80%
21
flagSingapore
0%
9%
4%
80%
21
flagCanada
2%
14%
2%
78%
69
flagPakistan
5%
11%
11%
70%
17
flagUnknown
13%
10%
3%
68%
29
flagIndia
11%
14%
2%
67%
334
flagthe United Arab Emirates
13%
17%
0%
62%
29
flagRepublic of Ireland
6%
18%
18%
56%
16
flagthe Philippines
27%
18%
2%
50%
44

Which direction is not possible to point at when standing at the South Pole?

east
west
north
neither east, west, nor south

What is the maximum distance a plane can fly travelling constantly North?

10,002 km
20,004 km
40,007 km
It can fly endlessly (as long it can)

How many edges does a Möbius strip have?

one
two
three
four

Which of the lines on the right, is the continuation of the black line on the left?

red one
blue one
none of them
both of them