Tubism occupies the comfortable middle of the value scale, avoiding both extremes to hold the eye in a sustained middle grey. The palette tilts toward cool - blues and silver-greys carry the structural weight. The absence of saturated colour is itself an expressive choice: this is a palette of restraint and atmosphere. The most saturated colour, #CABC34, is reserved to 2.1% of the surface, where it acts as a focal punctuation. The full value range is 58 units: broad enough to build convincing three-dimensional form. The mid-to-high key, cool bias, and moderate chroma point to outdoor observation - sky and diffused daylight as the dominant light source.