Heinrich Bürkel occupies the comfortable middle of the value scale, avoiding both extremes to hold the eye in a sustained middle grey. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. At 4.7%, #734B2D carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. A value spread of 55 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. This is palette 4 of Heinrich Bürkel's sequence - a single chapter in a chromatic story told across many works.