Optical illusions are often described as mind-boggling, mind-bendint, brain-frying, and everything in between. But let's be honest, most of the time all they elicit is a slight smirk, or maybe the odd ...

For many optical illusions, there’s a life cycle on a person-to-person basis, and it’s often pretty short (see exhibit A: the black and blue or white and gold dress). First, the observer sees the ...

Astronomers use telescopes to look back in time and observe stars and galaxies as they were millions and billions of years ...

Warning: This optical illusion might give you a headache. At a glance, the swirls of tilted black-and-white squares create the perception of a spiral. Look more closely and you realize that the ...