The project consists of a façade and interior renovation. The facade design transforms a bland, concrete elevation into a vibrant surface. The interior is inspired by the fashion catwalk; formerly dimly lit interior corridors are turned into bright and strongly directional runways.Located in Seoul, Korea, the Galleria Department Store exists within a typical system of highly specialized department stores, each representing a microcosm with its own eco-climate to which its customers are finely attuned. Situated at the top end of this system, the Galleria Department Store - together with the Galleria Masterpiece Hall nearby - houses a large number of highly prestigious brands and consequently attracts visitors from a wide area, including from Japan. The Galleria Department Store is prominently situated in the Apgujeong-dong district, one of the trendiest commercial districts in Seoul. The renewal of the exterior of the Galleria Department Store incorporates 4330 glass disks mounted on a metal substructure that is directly mounted on to the existing concrete cladding of the department store. These discs are treated with a special iridescent foil, which results in constant changes in the perception of the façade. During the day the atmospheric and weather changes influence the degree of reflection and absorption of light and color on the glass circles, so that from different viewing points the appearance of each disc and the total surface changes constantly according to external conditions At night the lighting design developed for the façade additionally starts to interact with the material condition of the glass discs. By placing behind each of the glass discs an LED-light source and by controlling the lights digitally one by one, the possibilities to manipulate color and light emission become endless. The patters generated can be adapted for special occasions and can be changed over time according to seasons, fashion events and artistic inspirations.The interior design focuses on the elimination of superfluous and outdated details and the introduction of two new Big Details: the escalator which becomes a moving event space, and the ceiling lighting which becomes a device that provides a fluent directionality and dynamics to the shop floors. The interior renovation is focused on the general store areas between the individual branded shops. UNStudio has sought to streamline the circulation spaces, providing ‘catwalks’ of light-coloured, glossy co-coordinated walkways and ceilings, which improve orientation and give the store a bright, fresh image. For the main circulation corridors (catwalks) the lighting is integrated within the dropped ceiling. The illumination of the corridor is designed as a continuous lighting element, which consist of linear rails following the direction of the corridors and bending whenever there is a change in direction.