Two simple illusions that you can sketch with a checker board

Some optical illusions require creative talent. You have to draw spirals, and pick the right colors, or at least have the ability to make two faces in profile look like one vase. Not these two illusions. The Hermann Illusion and the Scintillating Illusion require nothing more than a checkerboard. » 10/06/12 10:30am 10/06/12 10:30am