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. Just Add Color 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 Optical Illusions, 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 pull-out illustrations ready to be brought to life. Perfect to pull-out and frame, too!