The high-key values of Paul Grolleron give it an effulgent, almost bleached quality. Temperature is cool-dominant, with blue and green families claiming the largest areas. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. The highest-chroma note - #BDAF76 - appears at just 8.5%, deployed as a precision accent against the quieter ground. The full value range is 70 units: broad enough to build convincing three-dimensional form. 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 1 of Paul Grolleron's sequence - a single chapter in a chromatic story told across many works.