Munsell Color System

A 3D Color Space, devised in 1905 by Albert Munsell, an American art professor. Similar to HSV/HSL, it specifies colors based on Hue, Chroma, and Value, as seen in the below schematic, and was the first color space to completely separate Chroma and Value on separate axes. It has been refined into modern models CIELAB and CIECAM02 and is today only used in limited industries such as forensics and beer-brewing, but its influences are apparent in many modern Color Spaces.