The value structure of Regionalism is mid-key: quiet, controlled, and cohesive. Built on cool foundations: the palette favours the blue-cyan-green arc. Mid-range chroma keeps the palette grounded - colourful but not strident. The highest-chroma note - #4D3115 - appears at just 7.6%, deployed as a precision accent against the quieter ground. The value range spans 71 units across the palette, providing the full gamut from deep shadow to near-white and ensuring clear tonal hierarchy. High luminosity and cool temperature suggest the plein-air condition: unfiltered daylight and open sky.