Art Nouveau distributes its values across the middle register, creating harmony without high contrast. Temperature is balanced: the palette pits warm earth against cool sky without declaring a winner. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. #D4B261 delivers the chromatic peak at only 4.6% - a small shot of colour with outsized visual impact. A value spread of 56 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light.