COUNT THE INVISIBLE BEARS - SOLUTION: We managed to count 6 bears hidden in the landscape -- color-coded here for your convenience. But maybe we missed one or two!
PURPLE NURPLE: This purple swirl seems to move eerily, but it's actually a static image. As with other illusions of this type, the motion seems greatest in your peripheral vision.
DALI!: Here's a clever art installation created by Salvador Dali. From this angle it's hard to tell what you're looking at.
DESKTOP DELUSION: This simple sketch seems somehow to jump off the page. It's drawn in forced perspective, giving it the appearance of a three-dimensional object when viewed from this angle.
(All images courtesy of Mighty Optical Illusions.)