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.
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Answers by country

the one on the left
the one on the right
both are the same size
the first one you look at
answers
flagMalaysia
0%
6%
93%
0%
15
flagIndonesia
0%
0%
93%
0%
15
flagGreece
4%
4%
91%
0%
24
flagPoland
2%
8%
86%
2%
23536
flagAustria
2%
6%
86%
4%
46
flagGermany
2%
8%
85%
1%
275
flagSwitzerland
0%
5%
84%
0%
19
flagthe United Kingdom
2%
8%
83%
1%
272
flagSingapore
6%
10%
83%
0%
30
flagCanada
0%
9%
82%
6%
63
flagthe United States
3%
10%
81%
2%
808
flagNew Zealand
0%
12%
81%
6%
16
flagAustralia
3%
8%
80%
5%
84
flagFrance
0%
13%
80%
6%
15
flagUnknown
12%
12%
71%
3%
32
flagRepublic of Ireland
4%
26%
69%
0%
23
flagthe Netherlands
0%
21%
69%
0%
23
flagIndia
5%
18%
68%
3%
314
flagthe Philippines
11%
22%
54%
8%
35
flagthe United Arab Emirates
18%
36%
31%
4%
22