The value structure of Harry Phelan Gibb is mid-key: quiet, controlled, and cohesive. Harry Phelan Gibb 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. #B4BECD at 9.3% is both the most chromatic and one of the largest colours in the palette - chroma as mass rather than as highlight. 45 units of value spread create a palette that is varied but unified - contrast in the service of harmony. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky. This is palette 1 of Harry Phelan Gibb's sequence - a single chapter in a chromatic story told across many works.