Michiel van Musscher is low-key throughout, a quality associated with Abyssal Sienna - deep shadows dominate the composition. Heat pervades this palette; warm chromatic identities outweigh cool ones at almost every weight. Saturation is deliberately withheld - the beauty here lies in the near-monochromatic gradations rather than colour difference. At 38.3%, #15100F functions less as a colour accent and more as a complete atmospheric environment. The saturated accent, #B27757, registers at 2.8% - sparse enough to feel like a deliberate surprise. A value spread of 59 units gives the palette both depth and air - shadows are genuinely dark, lights genuinely light. The combination of low values, muted chroma, and compressed range is the signature of the Tonalist mode - painting as atmosphere. Palette 4 sits within the larger chromatic argument that Michiel van Musscher's complete body of work advances.