-advertisement-
13%

How many circles can you see in this image? Type your answer in below!

Fact Lab

Check out this great content

Continue to play the quiz afterwards
-advertisement-

Interesting fact:

Pilots have to take care against optical illusions whilst flying. When flying at night there are no visual reference points so the pilot can get vertigo and not know which way they are flying. This disorientation can make it impossible to know if they’re going up or down, left or right.