Light floods Art Nouveau; the palette keeps values pale and airy across its range. Built on cool foundations: the palette favours the blue-cyan-green arc. Muted throughout, the palette achieves its effects through value and temperature rather than chromatic force. 30.4% of the palette belongs to #E7DFD2, a concentration that makes it the unmistakable visual centre. The highest-chroma note - #A33D3F - appears at just 2.4%, deployed as a precision accent against the quieter ground. At 74 units of value range, the palette has the tonal breadth to sustain complex spatial readings. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky.