Dazzling Optical Illusions

All these brilliantly beautiful, surprising images are out to fool your eye! For example, even though a shape has only two or three colors, the background can trick you into thinking there’s a rainbow of tints and shades. Or, the same grid of squares can look completely different depending on whether it has an outline or not. Plus: decipher “alien writing,” figure out whether the animal in a drawing is a pink flamingo or Indian elephant, and observe mystic spirals.