Which orange circle is larger?

the one on the left
the one on the right
both are the same size
the first one you look at
This is known Ebbing­haus il­lu­sion. Although commonly thought of as an illusion of size, recent work suggests that the critical factor in the illusion is not the size, but the distance of the sur­round­ing circles. In a similar way, the Moon appears larger on clear sky when it's close to the horizon line.

Answers distribution

the one on the left
the one on the right
both are the same size
the first one you look at
answers
flagFinland
0%
1%
98%
0%
69
flagItaly
0%
3%
96%
0%
76
flagNorway
0%
2%
95%
2%
42
flagSpain
0%
2%
94%
0%
37
flagGreece
0%
7%
92%
0%
26
flagthe United Arab Emirates
2%
6%
91%
0%
49
flagGermany
0%
7%
89%
3%
292
flagPoland
1%
7%
87%
2%
21173
flagUnknown
2%
8%
86%
2%
1551
flagthe United Kingdom
1%
8%
86%
1%
623
flagCroatia
9%
4%
86%
0%
22
flagthe United States
2%
7%
85%
2%
899
flagthe Netherlands
1%
10%
85%
2%
95
flagRepublic of Ireland
5%
9%
83%
1%
85
flagSweden
0%
17%
82%
0%
23
flagCanada
3%
12%
79%
4%
62
flagAustralia
3%
12%
78%
5%
57
flagFrance
8%
10%
77%
1%
57
flagIndia
3%
15%
71%
3%
232
flagthe Philippines
0%
32%
60%
3%
28

Gender

men89%
women92%
the one on the left
1%
0%
the one on the right
6%
4%
both are the same size
89%
92%
the first one you look at
2%
1%

Language versions

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answers
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Which orange circle is larger?
1849
81%

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