interior occupies the comfortable middle of the value scale, avoiding both extremes to hold the eye in a sustained middle grey. Warm and cool are kept in productive tension, creating the kind of chromatic harmony that sustains the eye. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. The saturated accent, #D5CBB5, registers at 5.5% - sparse enough to feel like a deliberate surprise. The full value range is 57 units: broad enough to build convincing three-dimensional form.