Proposal for a national competition about Social HousingWhy should the city be a problem? Envisioning the decay of urban city centers, we propose not looking at the empty spaces in 2 dimensions, but with its full potential, tridimensional complexity, and to create a link between spaces that connect and revitalize urban infills with multiple programs and spaces. New plug-in structures will be developed to supply the city with diversity.Increase quality of life and urban life by mixing programs and working with an utopia - an theoretical approach to change the way we see our cities.