Johann Joseph Jansen is high in key: pale, luminous, and filled with optical air. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. The saturated accent, #9C8340, registers at 4.2% - sparse enough to feel like a deliberate surprise. 51 units of value spread create a palette that is varied but unified - contrast in the service of harmony. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. This is palette 1 of Johann Joseph Jansen's sequence - a single chapter in a chromatic story told across many works.