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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
57%
10%
10%
21%
19
flagthe Netherlands
57%
7%
7%
28%
14
flagthe United States
45%
19%
21%
12%
338
flagIndia
45%
22%
16%
13%
159
flagCanada
45%
20%
30%
5%
20
flagBelarus
44%
12%
36%
4%
25
flagthe United Kingdom
43%
21%
19%
15%
127
flagthe Philippines
43%
18%
25%
12%
16
flagPoland
41%
20%
22%
15%
13893
flagUkraine
41%
16%
26%
15%
148
flagRepublic of Ireland
41%
11%
29%
17%
17
flagGermany
40%
25%
20%
10%
266
flagAustria
40%
20%
23%
16%
55
flagUnknown
40%
18%
27%
13%
22
flagFrance
38%
23%
15%
23%
13
flagRussia
36%
19%
28%
14%
135
flagGreece
31%
21%
15%
31%
19
flagKazakhstan
27%
33%
22%
16%
18
flagUzbekistan
23%
7%
30%
38%
13
flagAustralia
20%
20%
28%
28%
25

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