Light establishes a perceptible continuity across the line, while revealing the singular identity of its five major stations. It accompanies passengers through a fluid and immersive journey, from the city down to the depth of the platforms. Through a shared language, light shapes perception, reveals materials, and enhances volumes, without diminishing the specificity of each architecture. Atmospheres are warm, legible, and adaptive, responding to flows and rhythms of use to support a calm and intuitive travel experience. At night, the project carefully controls its luminous presence, restoring a more balanced relationship to time, space, and darkness.