Mid-key values give Louis Abel-Truchet its characteristic quietness - nothing blazes, nothing disappears. Louis Abel-Truchet builds on cool foundations: the palette favours the blue-cyan-green arc. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. #E2D8AA delivers the chromatic peak at only 5.0% - a small shot of colour with outsized visual impact. A value spread of 62 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. These proportions encode Louis Abel-Truchet's instinctive sense of how much of each quality the eye can hold.