Mid-key values give William Simpson its characteristic quietness - nothing blazes, nothing disappears. William Simpson orchestrates warmth above all else - reds, ambers, and siennas take the lead. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. The highest-chroma note - #8D7047 - appears at just 4.4%, deployed as a precision accent against the quieter ground. 56 units of value range underpin the palette's structural clarity: the eye always knows where light falls. William Simpson's palette 4 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.