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

the Netherlands

57%

28%

Switzerland

56%

13%

17%

the United States

46%

19%

20%

12%

356

India

45%

22%

17%

13%

160

Republic of Ireland

44%

11%

27%

16%

the Philippines

43%

18%

25%

12%

Germany

42%

24%

20%

11%

300

the United Kingdom

42%

21%

19%

16%

131

Canada

42%

23%

28%

Poland

41%

20%

22%

15%

14083

Ukraine

41%

16%

26%

15%

153

Austria

40%

19%

24%

15%

Unknown

40%

18%

27%

13%

Belarus

39%

14%

39%

France

38%

23%

15%

23%

Russia

36%

19%

29%

13%

141

Greece

33%

19%

14%

33%

Kazakhstan

30%

25%

15%

Australia

23%

19%

26%

Uzbekistan

21%

28%

42%

Which area is brighter?

Both are the same

It depends on the order of seeing

How many dots at the intersections are black?

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?