The value structure of Erich Heckel is mid-key: quiet, controlled, and cohesive. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. #AC5F55 functions as the palette's exclamation mark: highest chroma, lowest percentage (4.3%). The palette spans 46 value units: a measured range that delivers coherence over drama. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. In the context of Erich Heckel's full range of palettes, group 5 represents one movement in an ongoing chromatic dialogue.