Achille Zo distributes its values across the middle register, creating harmony without high contrast. A distinctly cool atmosphere runs through this palette: sky, water, and mist given colour form. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. #C28E59 delivers the chromatic peak at only 8.8% - a small shot of colour with outsized visual impact. The full value range is 76 units: broad enough to build convincing three-dimensional form. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. In the context of Achille Zo's full range of palettes, group 1 represents one movement in an ongoing chromatic dialogue.