Color theory, which is made up of dozens of concepts and design applications, creates a structure for how we use and describe color. While we know color is produced when light reflects back to the eye, color theory is considered a theory because it cannot be proven. That said, the terms and principles illustrated in the infographic below are widely accepted and practiced in the art world and every day applications. Read on to learn about primary, secondary, and tertiary colors, combining color, describing color, and how printers produce color.