The lighting design of Galeries Lafayette department store in Paris is based on the coexistence of history and technology as its soul. The colorful glass canopy of the dome filters the ever-changing natural light, interweaving with the warm light of the gold-plated chandelier, replicating the luxurious beauty of the 19th century Art Nouveau era; Modern intelligent systems use hidden LED light strips to accurately outline architectural reliefs, and adjustable spotlights to highlight the texture of products with dynamic light and shadow. At night, the cool white color inside the glass curtain wall contrasts with the warm yellow color inside the store, enhancing the attractiveness of the storefront while maintaining the classical temperature of the interior space. This game of light and shadow keeps century old buildings vibrant with commercial vitality as they circulate day and night.