The document summarizes the Mercat Santa Caterina market redevelopment project in Barcelona, Spain designed by architects Enric Miralles and Benedetta Tagliabue. The project transformed a dour neoclassical market into a vibrant space with a colorful, undulating roof composed of over 300,000 hexagonal ceramic tiles supported by a forest of steel pillars. The design integrated the old market structure, uncovered Roman ruins, and surrounding streets and plaza, fusing modern and historical elements to create an ultra-modern public space in the heart of the city.