Color theory.
By A Mystery Man Writer
A Color Skeptic's Guide to Color Theory in Design, Wit & Delight
Color Theory & Color Palettes Inspired By Nature — State of Sage
Teach Color Theory with the Interactive Color Wheel
Color Wheels for Teaching Color Theory - Expressive Monkey
The Dimensions of Colour, traditional colour wheel
The Importance of Colour Theory
What is Color Theory?
Understanding Color Theory in Film: Basics and Beyond
What is Color Theory — A Guide for Image Makers