The value structure of Art Brut is mid-key: quiet, controlled, and cohesive. The dominant temperature is warm, with earth tones and fire-hues setting the emotional key. Mid-saturation across the board: the palette has colour character without chromatic excess. At 6.8%, #AC6439 carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. The full value range is 66 units: broad enough to build convincing three-dimensional form.