Theo van Rysselberghe distributes its values across the middle register, creating harmony without high contrast. Theo van Rysselberghe tilts toward cool - blues and silver-greys carry the structural weight. Colours are neither washed out nor blazing; they occupy the productive middle ground of the chroma scale. At 8.2%, #3B3577 carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. 49 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. In the context of Theo van Rysselberghe's full range of palettes, group 12 represents one movement in an ongoing chromatic dialogue.