The value structure of Thomas Sully is mid-key: quiet, controlled, and cohesive. The dominant temperature is warm, with earth tones and fire-hues setting the emotional key. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. The highest-chroma note - #784D2D - appears at just 7.3%, deployed as a precision accent against the quieter ground. At 73 units of value range, the palette has the tonal breadth to sustain complex spatial readings. This is palette 4 of Thomas Sully's sequence - a single chapter in a chromatic story told across many works.