The color wheel arranges hues in a circle based on their relationships. The first version was created by Isaac Newton in 1666. He bent the spectrum into a circle to show how colors relate. Since then, many variations have appeared. The traditional artist's wheel uses red, yellow, and blue as primaries. The modern CMYK wheel uses cyan, magenta, and yellow. The RGB wheel uses red, green, and blue. Each serves a different medium and purpose.

The wheel shows relationships at a glance. Colors opposite each other are complementary. Colors next to each other are analogous. Colors evenly spaced form triads. The wheel is a tool, not a rule. It helps designers find combinations that work. It also helps them understand why some combinations clash. The wheel does not capture every nuance. Value, saturation, and context all affect how colors appear together. A color that looks balanced on the wheel may look wrong in a specific layout. The designer's eye is the final judge. The wheel is a starting point. It gives structure to the infinite space of color. Without it, choosing colors is guesswork. With it, the choices have logic. The logic can be followed or broken. Knowing the rules makes breaking them intentional.

Color wheel models

• RYB — traditional artist's wheel, red, yellow, blue primaries
• CMY — printing wheel, cyan, magenta, yellow primaries
• RGB — screen wheel, red, green, blue primaries
• HSV — hue, saturation, value cylinder

The color wheel is a map. It shows where colors are and how they relate. The territory is more complex, but the map helps.