The value structure of Hubert Robert is mid-key: quiet, controlled, and cohesive. Hubert Robert builds on cool foundations: the palette favours the blue-cyan-green arc. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. The highest-chroma note - #A4905E - appears at just 6.2%, deployed as a precision accent against the quieter ground. At 58 units of value range, the palette has the tonal breadth to sustain complex spatial readings. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. This is palette 3 of Hubert Robert's sequence - a single chapter in a chromatic story told across many works.