The single unifying roof canopy is perforated with skylights to aid orientation and bring daylight deep into the building. The colour palette moves through 16 tones from red at the entrance at T3A through to orange and finally yellow at the far end of T3B. This establishes a subtle zoning system that breaks down the scale of the building and enables easy wayfinding. This palette is also applied north to south in the ceiling above the arrivals and departures halls, heightening the sense of curvature in the roof plane.