Herbert Arnould Olivier dwells firmly in the shadows, with no more than a whisper of light. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Muted throughout, the palette achieves its effects through value and temperature rather than chromatic force. At 26.4%, #25231A functions less as a colour accent and more as a complete atmospheric environment. The highest-chroma note - #ECCF9F - appears at just 1.3%, deployed as a precision accent against the quieter ground. The full value range is 61 units: broad enough to build convincing three-dimensional form. This tonal restraint is characteristic of the Herbert Arnould Olivier approach: colour serves light, not the reverse. This is palette 4 of Herbert Arnould Olivier's sequence - a single chapter in a chromatic story told across many works.