The document discusses color theory and the color wheel. It explains that Sir Isaac Newton first represented the relationship between colors in the form of a circle in 1672 after observing a rainbow through a prism. A century later, Johann Wolfgang von Goethe studied how different colors evoke different emotions. The color wheel is divided into primary, secondary, and intermediate colors. It also describes color schemes such as monochromatic, complementary, analogous, warm, and cool colors. Monochromatic uses one color, while complementary and analogous use colors relative to each other on the color wheel.