The value structure of Rudolf Koller is mid-key: quiet, controlled, and cohesive. Rudolf Koller tilts toward cool - blues and silver-greys carry the structural weight. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. The highest-chroma note - #844E2E - appears at just 1.4%, deployed as a precision accent against the quieter ground. At 51 units across the value scale, the palette keeps contrast readable without letting it dominate. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. In the context of Rudolf Koller's full range of palettes, group 3 represents one movement in an ongoing chromatic dialogue.