The document discusses the color wheel, which represents the relationship between colors. It was designed by Sir Isaac Newton in 1666. The color wheel includes primary colors (red, yellow, and blue), secondary colors formed by mixing two primary colors (orange, green, and violet), and tertiary colors formed by mixing a primary and secondary color (yellow-green, blue-green, etc.). Primary colors cannot be created by mixing other colors, secondary colors are formed by mixing two primary colors, and tertiary colors are a mix of a primary and secondary color.