The directional sign system of Paris–Charles de Gaulle: white Frutiger letters reversed out of dark Aeroports de Paris signage blue, mounted on the brutalist concrete of Paul Andreu's circular Aerogare 1. Adrian Frutiger designed the face 'Roissy' specifically for this terminal, tuned for maximum legibility from 10 to 100 metres.

This system distills that wayfinding logic into an interface language: deep navy panels, crisp white humanist sans, arrow-and-pictogram bands, and a hierarchy built for reading at distance. Flat, illuminated, and relentlessly legible.