Who says coloring is just for kids? No longer relegated to kindergarten classrooms, coloring has grown up and taken its place alongside painting or drawing as a legitimate form of artistic expression and a meditative way to relax. <i>Just Add Color</i> is a brilliant series of adult coloring books that will send even the most mature among us running for the nearest box of colored pencils. In <i>Optical Illusions</i>, find mind-boggling illusions that move, spiral, and drift as you color. These illustrations are as challenging as they are beautiful. Features more than 120 gorgeous illustrations ready to be brought to life.