The value structure of Luc-Olivier Merson is mid-key: quiet, controlled, and cohesive. Cool hues prevail: blues, greens, and greys anchor the palette's emotional temperature. Muted throughout, the palette achieves its effects through value and temperature rather than chromatic force. The most saturated colour, #896C42, is reserved to 8.9% of the surface, where it acts as a focal punctuation. At 61 units of value range, the palette has the tonal breadth to sustain complex spatial readings. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. This is the light Luc-Olivier Merson preferred, made measurable.