Light floods Alphonse Mucha; the palette keeps values pale and airy across its range. Blues and teal-greys govern the palette, lending it an aquatic or atmospheric quality. Mid-saturation across the board: the palette has colour character without chromatic excess. At 28.0%, #E0C368 functions less as a colour accent and more as a complete atmospheric environment. The highest-chroma note - #DE671B - appears at just 0.7%, deployed as a precision accent against the quieter ground. A value spread of 61 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. In the context of Alphonse Mucha's full range of palettes, group 5 represents one movement in an ongoing chromatic dialogue.