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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%
16%
12%
16%
25
flagthe Netherlands
50%
5%
16%
27%
18
flagthe United States
48%
18%
20%
12%
370
flagIndia
45%
22%
17%
14%
164
flagthe United Kingdom
43%
20%
19%
16%
140
flagthe Philippines
43%
18%
25%
12%
16
flagCanada
42%
23%
28%
4%
21
flagRepublic of Ireland
42%
10%
31%
15%
19
flagPoland
41%
20%
22%
15%
14135
flagGermany
41%
23%
21%
11%
330
flagUkraine
41%
16%
26%
15%
154
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
36%
18%
29%
13%
144
flagGreece
33%
19%
14%
33%
21
flagKazakhstan
28%
28%
28%
14%
21
flagAustralia
25%
18%
25%
25%
27
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