Amazing Anamorphic Illusions
These illusions will absolutely stun you. Anamorphic illusions use vantage point and perspective to distort and reconstitute images. From one angle, a flat drawing seems to come to life, then retreat back to its former state upon the viewer moving to a new vantage point.
These three illusions come with links to the images so that you can print them out and try them on your friends.