This project was part of a competition that claimed to bring a new architectural symbol to the city of Barcelona and its international reputation of Modernism. The site is in the revitalizing "Raval" district of the city. It is part of a block of multiple public equipments like the Museum of Contemporary Art of Barcelona (MACBA) by R. Meier. This area constitutes a renewing pole in the heart of the city. The program mixed 40 housings, a nursery and a cultural center dedicated to the art of dance. Taking the Casa Mila (La Pedrera) of Antoni Gaudi, built 100 years before, as a reference and inspiration, the concept of the quarry (quarry=pedrera) is fully dictating the form. People have to go through dug trench under the building to access the center courtyard. The project is developed inside a prismatic shape coated with an homogeneous skin. This coat is in fact an opalescent hairnet of which intensity varies depending on what part of the program it covers. Under this opalescent glass hairnet is a transparent glass skin. The two skins are independent and fully mobile when it comes to the housing part of the building. This allows modulable views, light and cross-ventilation.