Willem Koekkoek distributes its values across the middle register, creating harmony without high contrast. A distinctly cool atmosphere runs through this palette: sky, water, and mist given colour form. Muted throughout, the palette achieves its effects through value and temperature rather than chromatic force. #AF8551 functions as the palette's exclamation mark: highest chroma, lowest percentage (7.5%). At 51 units across the value scale, the palette keeps contrast readable without letting it dominate. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. The palette is recognisably Willem Koekkoek's own: particular in its temperature, chroma, and the economy of its brightest note.