The high-key values of Art Nouveau give it an effulgent, almost bleached quality. Built on cool foundations: the palette favours the blue-cyan-green arc. Saturation is measured and controlled, giving the palette presence without visual aggression. Only 6.5% is devoted to #B67341, yet that small allocation delivers the palette's entire chromatic tension. From deepest dark to palest light, the palette traverses 65 units of the value scale - a span that creates natural depth. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky.