Our brains can do amazing things—but in the right circumstances, they can also fool us. Try the brain tricks and teasers below and find out what’s going on in the brain in each one. If you’re looking for more brainy fun, try BrainHQ.

Motion Ambiguity
Although they "fool the eyes," optical...
Long and Short
Look at this geometric shape. Which...
Twisted Squares
Look at the red figures. Are...
Rainbow Illusion
What happens when you stare at...
Titchener Circles
Observe the two sets of circles...
Double Talk
Are you smarter than a first...