The optical illusion going viral on Reddit challenges people to find 16 circles in a photo filled with rectangular panels.

An optical illusion has been doing the rounds on social media, with many people left scratching their heads as they struggle ...

American psychologist Joseph Jastrow made this illusion in 1899 – to make a point about how the brain perceives what is in ...

A brain teaser challenges viewers to find a hidden cat in a patio scene. The puzzle tests observation skills, claiming only ...