Achille Pinelli is strongly light-biased - shadow is suggested rather than declared. Temperature is cool-dominant, with blue and green families claiming the largest areas. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. At 6.3%, #A0876D carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. A value spread of 67 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. Palette 4 sits within the larger chromatic argument that Achille Pinelli's complete body of work advances.