Our pick of the best optical illusions of all time will leave you amazed and confused in equal measure.

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Illusions like these mess ...

While new optical illusions go viral all the time, here are some of the most famous illusions that have kept us scratching our heads for years.

Visual filled space (Oppel-Kundt) and auditory filled time illusions distort the perception of spatial width and temporal length, respectively. Although these two illusions occur in different physical ...