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 Republic16
Malaysia17
Greece26
Austria55
Switzerland33
Poland24206
Germany359
the United Kingdom299
Singapore30
Canada67
New Zealand17
the United States857
Australia87
South Africa16
Unknown33
India337
the Netherlands27
Republic of Ireland26
the Philippines36
the United Arab Emirates24