Susan Newberry introduces the reader to color theory. She discusses how color perception is affected by different light sources and surroundings. The document explains primary, secondary, and tertiary colors and how they relate on the color wheel. It also covers how hue, value, warmth, and coolness impact color and how altering these properties creates tints, tones and shades. The key aspects of color theory covered are the color wheel, primary/secondary/tertiary colors, tints, tones and shades, and how warm and cool colors influence perception.