Francis Gruber distributes its values across the middle register, creating harmony without high contrast. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Every colour is desaturated; the palette proceeds through near-neutrals and gently-coloured greys. Only 9.8% is devoted to #5D5123, yet that small allocation delivers the palette's entire chromatic tension. 58 units of value range underpin the palette's structural clarity: the eye always knows where light falls. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. These proportions encode Francis Gruber's instinctive sense of how much of each quality the eye can hold.