Mid-key values give Oswald Achenbach its characteristic quietness - nothing blazes, nothing disappears. Oswald Achenbach 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. At 10.7%, #402D16 carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. 62 units of value range underpin the palette's structural clarity: the eye always knows where light falls. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. Palette 7 sits within the larger chromatic argument that Oswald Achenbach's complete body of work advances.