Values in Giuseppe Galli Da Bibiena rest in the mid-range - neither dramatically lit nor steeped in shadow. Cool tones set the register here - the blues and greens easily outweigh any warm accents. Chroma is kept low across all colours, producing the soft, enveloping quality that characterises tonal painting. The saturated accent, #CFCAB9, registers at 4.0% - sparse enough to feel like a deliberate surprise. From deepest dark to palest light, the palette traverses 65 units of the value scale - a span that creates natural depth. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source. These proportions encode Giuseppe Galli Da Bibiena's instinctive sense of how much of each quality the eye can hold.