Light floods Gustave Loiseau; the palette keeps values pale and airy across its range. Gustave Loiseau 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 saturated accent, #BEA275, registers at 5.9% - sparse enough to feel like a deliberate surprise. The value range of 52 units sits in the comfortable middle: enough depth, enough light, neither extreme. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. In the context of Gustave Loiseau's full range of palettes, group 3 represents one movement in an ongoing chromatic dialogue.