Mid-key values give Gregorio Undurraga its characteristic quietness - nothing blazes, nothing disappears. 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. #506B8C functions as the palette's exclamation mark: highest chroma, lowest percentage (10.2%). Value range is moderate at 29 units - enough contrast for legibility, not so much as to fragment the tonal unity. 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 Gregorio Undurraga's full range of palettes, group 4 represents one movement in an ongoing chromatic dialogue.