The value structure of Oswald Achenbach is mid-key: quiet, controlled, and cohesive. Temperature is cool-dominant, with blue and green families claiming the largest areas. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. Only 4.8% is devoted to #B18341, yet that small allocation delivers the palette's entire chromatic tension. 62 units of value range underpin the palette's structural clarity: the eye always knows where light falls. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. In the context of Oswald Achenbach's full range of palettes, group 8 represents one movement in an ongoing chromatic dialogue.