Low-key values are the structural spine of Simon Dubois, giving it gravity and atmosphere. Neither warm nor cool has the upper hand here; the equilibrium between the two generates the palette's visual energy. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. Simon Dubois gives 25.7% of the composition to a single #0E1413 - a decisive chromatic anchor. The highest-chroma note - #B99D5E - appears at just 3.3%, deployed as a precision accent against the quieter ground. Value range is moderate at 53 units - enough contrast for legibility, not so much as to fragment the tonal unity. Together these qualities place Simon Dubois firmly in the tonal tradition - concerned with mood and atmosphere rather than chromatic display. This is palette 3 of Simon Dubois's sequence - a single chapter in a chromatic story told across many works.