Wilhelm Trübner dwells firmly in the shadows, with no more than a whisper of light. Wilhelm Trübner builds on cool foundations: the palette favours the blue-cyan-green arc. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. The most saturated colour, #B0846F, is reserved to 2.3% of the surface, where it acts as a focal punctuation. From deepest dark to palest light, the palette traverses 58 units of the value scale - a span that creates natural depth. 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 Wilhelm Trübner's complete body of work advances.