Post-Impressionism occupies the comfortable middle of the value scale, avoiding both extremes to hold the eye in a sustained middle grey. Built 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. #A33E2D functions as the palette's exclamation mark: highest chroma, lowest percentage (4.0%). Value range is moderate at 52 units - enough contrast for legibility, not so much as to fragment the tonal unity. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source.