William Leighton Leitch distributes its values across the middle register, creating harmony without high contrast. Cool tones set the register here - the blues and greens easily outweigh any warm accents. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. The highest-chroma note - #7D6D52 - appears at just 10.5%, deployed as a precision accent against the quieter ground. A value spread of 70 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. In the context of William Leighton Leitch's full range of palettes, group 4 represents one movement in an ongoing chromatic dialogue.