Mid-key values give Le Corbusier its characteristic quietness - nothing blazes, nothing disappears. Le Corbusier builds on cool foundations: the palette favours the blue-cyan-green arc. Every colour is desaturated; the palette proceeds through near-neutrals and gently-coloured greys. The highest-chroma note - #785F4E - appears at just 8.1%, deployed as a precision accent against the quieter ground. The palette spans 42 value units: a measured range that delivers coherence over drama. 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 4 of Le Corbusier's sequence - a single chapter in a chromatic story told across many works.