The value structure of Tonalism is mid-key: quiet, controlled, and cohesive. Yellow, ochre, sienna: warm hues deployed as the palette's primary energy. Chroma hovers near zero; colour declares itself through subtle shifts in hue rather than outright saturation. #725121 functions as the palette's exclamation mark: highest chroma, lowest percentage (9.3%). A value spread of 73 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light.