Light floods Antoine Pierre Mongin; the palette keeps values pale and airy across its range. Antoine Pierre Mongin builds on cool foundations: the palette favours the blue-cyan-green arc. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. At 38.9%, #C2CED5 functions less as a colour accent and more as a complete atmospheric environment. The saturated accent, #7F634D, registers at 3.5% - sparse enough to feel like a deliberate surprise. Spanning 44 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. In the context of Antoine Pierre Mongin's full range of palettes, group 1 represents one movement in an ongoing chromatic dialogue.