Art Nouveau is strongly light-biased - shadow is suggested rather than declared. Built on cool foundations: the palette favours the blue-cyan-green arc. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. A single dominant - #E3D3B3 at 25.9% - sets the character of the whole composition. At 3.6%, #845F45 carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. 68 units of value range underpin the palette's structural clarity: the eye always knows where light falls. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source.