This is the color wheel. The name is pretty self-explanatory, it is a wheel of colors. However, this wheel shows the the primary and secondary colors. The primary colors are red, yellow, and blue. The secondary colors are orange, green and violet — which are a mix of two of either of the primary colors. The opposite color of one, such blue is to orange, that is complementary. Tertiary colors are a mix of two of the secondary colors, and quaternary colors are the mix of two of the tertiary colors.