The value structure of Post-Impressionism is mid-key: quiet, controlled, and cohesive. Built on cool foundations: the palette favours the blue-cyan-green arc. A restrained, mid-chroma palette: every hue is present and legible, but nothing shouts. #BC6931 delivers the chromatic peak at only 7.1% - a small shot of colour with outsized visual impact. Spanning 48 units on the value axis, the palette achieves the balance between tonal flatness and fragmentation. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky.