An object's color appears differently under different lighting and against different backgrounds — for different viewers. But ...

A new experiment suggests that the thalamus plays a key role in humans becoming consciously aware of stimuli their brain ...

More importantly, optical illusions remind us how differently we perceive things. While one person may spot the hidden kitten ...

"The executive will lose much from a public perception of its lawlessness," U.S. Circuit Judge J. Harvie Wilkinson wrote on ...