The value structure of Giotto is mid-key: quiet, controlled, and cohesive. Giotto builds on cool foundations: the palette favours the blue-cyan-green arc. All colours lean toward grey, building depth through value rather than colour punch. The saturated accent, #DFCFB8, registers at 10.7% - sparse enough to feel like a deliberate surprise. At 56 units of value range, the palette has the tonal breadth to sustain complex spatial readings. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. Palette 4 sits within the larger chromatic argument that Giotto's complete body of work advances.