questionedithistorytranslations

How is this polygon called? (the one over the circles)

square
rhomboid
concave square
concave rhomboid
In this Ehrenstein illusion the sides of a square placed inside a pattern of concentric circles take an apparent curved shape. But in reality, the sides are straight.
Debbie Fox
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Correct this question
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Very interesting!
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Answers by country

square
rhomboid
concave square
concave rhomboid
answers
flagPoland
69%
12%
9%
7%
30507
flagFrance
68%
20%
4%
8%
25
flagGreece
65%
13%
6%
13%
29
flagAustria
64%
8%
11%
11%
59
flagSwitzerland
64%
5%
23%
5%
39
flagGermany
63%
10%
18%
6%
402
flagCanada
62%
12%
12%
11%
72
flagthe Netherlands
62%
6%
20%
3%
29
flagthe United Kingdom
61%
9%
16%
10%
265
flagSingapore
61%
23%
15%
0%
26
flagthe United States
60%
12%
17%
7%
1023
flagUnknown
59%
9%
11%
19%
42
flagIndonesia
57%
5%
26%
10%
19
flagAustralia
54%
14%
14%
16%
81
flagRepublic of Ireland
48%
14%
14%
18%
27
flagMalaysia
47%
13%
21%
17%
23
flagPakistan
47%
9%
33%
4%
21
flagIndia
46%
15%
19%
15%
413
flagthe Philippines
41%
13%
16%
24%
65
flagthe United Arab Emirates
37%
25%
14%
17%
35

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 shape is larger?

A
B
None of them
Both are larger