The value structure of Harry Phelan Gibb is mid-key: quiet, controlled, and cohesive. Temperature is cool-dominant, with blue and green families claiming the largest areas. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. At 3.8%, #B55F3B carries the palette's sharpest chromatic charge: an accent that earns its place precisely because it is withheld. Value range is moderate at 53 units - enough contrast for legibility, not so much as to fragment the tonal unity. The palette has the character of outdoor light: cool, mid-bright, with colour rendered faithfully rather than expressively. Harry Phelan Gibb arrived at this balance through long practice; the palette carries the weight of that experience.