Light floods Art Nouveau; the palette keeps values pale and airy across its range. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Every colour is desaturated; the palette proceeds through near-neutrals and gently-coloured greys. The most saturated colour, #B69875, is reserved to 7.4% of the surface, where it acts as a focal punctuation. The value range spans 57 units across the palette, providing the full gamut from deep shadow to near-white and ensuring clear tonal hierarchy. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky.