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.
reach: rather globalillusionsoptical illusionstechnology
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
Czech Republic
16
Malaysia
17
Greece
25
Austria
53
Switzerland
32
Poland
24105
Germany
340
the United Kingdom
297
Singapore
30
Canada
67
New Zealand
17
the United States
846
Australia
87
South Africa
16
Unknown
32
India
337
the Netherlands
26
Republic of Ireland
26
the Philippines
36
the United Arab Emirates
24