Art Nouveau works in the upper reaches of the value scale, creating an atmosphere of brightness and expansiveness. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Mid-saturation across the board: the palette has colour character without chromatic excess. The saturated accent, #B75E3C, registers at 3.7% - sparse enough to feel like a deliberate surprise. Spanning 52 units on the value axis, the palette achieves the balance between tonal flatness and fragmentation. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky.