Antonio Jacobsen is high-key - luminous, open, and weighted toward light. 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. At 37.8%, #E7F1F0 functions less as a colour accent and more as a complete atmospheric environment. Only 4.5% is devoted to #B4B17E, yet that small allocation delivers the palette's entire chromatic tension. From deepest dark to palest light, the palette traverses 69 units of the value scale - a span that creates natural depth. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. This is palette 1 of Antonio Jacobsen's sequence - a single chapter in a chromatic story told across many works.