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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
flagSwitzerland
56%
13%
13%
17%
23
flagthe Netherlands
53%
6%
6%
33%
15
flagthe United States
46%
18%
20%
12%
358
flagIndia
45%
22%
17%
13%
160
flagthe Philippines
43%
18%
25%
12%
16
flagGermany
42%
24%
20%
11%
304
flagthe United Kingdom
42%
21%
19%
16%
136
flagCanada
42%
23%
28%
4%
21
flagRepublic of Ireland
42%
10%
31%
15%
19
flagPoland
41%
20%
22%
15%
14105
flagUkraine
41%
16%
26%
15%
153
flagAustria
41%
18%
24%
15%
58
flagUnknown
40%
18%
27%
13%
22
flagBelarus
39%
14%
39%
3%
28
flagFrance
38%
23%
15%
23%
13
flagRussia
35%
19%
29%
13%
142
flagGreece
33%
19%
14%
33%
21
flagKazakhstan
28%
28%
28%
14%
21
flagAustralia
23%
19%
26%
26%
26
flagUzbekistan
21%
7%
28%
42%
14

Which area is brighter?

A
B
Both are the same
It depends on the order of seeing

How many dots at the intersections are black?

10%
25%
50%
None

The bright circle around the Sun seen in the picture is known as a halo. What causes it?

refraction of light in ice crystals
refraction in the lens of the eye or lens
refraction of light in water drops
reflections from the water surface

Which lines are parallel?

blue and red only
green and red only
green, blue and red
none