Fig. 3
The Color Sphere. The HUES are placed in sequence around the NEUTRAL axis. The axis and all the HUES surrounding it are all of the same VALUE (lightness or darkness), or any given level, increasingly ligher to White at the top and increasingly darker to Black at the bottom. From NEUTRAL Gray at the center axis. the HUES increase in color-strength or intensity (CHROMA) as the distance outward from the axis is increased.