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
This is known as Poggendorff illusion, first described in 1860. Many detailed studies of the illusion point to its principal cause: acute angles in the figure are seen by viewers as expanded.
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Answers by country
red one
blue one
none of them
both of them
answers
Switzerland
20
the Netherlands
14
the United States
339
India
159
the Philippines
16
the United Kingdom
128
Belarus
26
Canada
21
Poland
13947
Germany
273
Ukraine
153
Republic of Ireland
17
Austria
55
Unknown
22
France
13
Russia
139
Greece
19
Kazakhstan
20
Uzbekistan
13
Australia
25