Rudolf Koller distributes its values across the middle register, creating harmony without high contrast. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Every colour is desaturated; the palette proceeds through near-neutrals and gently-coloured greys. Only 6.0% is devoted to #937A56, yet that small allocation delivers the palette's entire chromatic tension. The full value range is 67 units: broad enough to build convincing three-dimensional form. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. Rudolf Koller's palette 4 carries its own internal logic while remaining in conversation with the artist's broader colour intelligence.