The color wheel is a system of organizing identifiable hues in a way that helps artists understand the relationship between colors. The color wheel is shaped like a ring, and is made up of twelve hues. Primary, secondary, and tertiary colors are identified on the wheel. Colors placed on directly opposite sides of the wheel are considered complimentary. According to the color wheel, yellow and violet are complimentary colors. Artists use complimentary colors to create vivid, aesthetically powerful images.