Door Front City Ground floor design as a reappropriation of social space Keywords: community, temporal, porosity The laboratory of Ephemeral Design has been exploring for years the temporal matrix of spaces as an intrinsic quality of the project, on which to model spaces, activities, behaviors, etc. The Ephemeral/Temporary spaces Laboratory wants to investigate the issues of time and senses in relation to the ephemeral spatial design project. The key concept to be investigated, is based on the idea that, in the future, there will be not the forms of space but the forms of time at the center of the project methodology. The theme is Door Front City, based on the theories of the 15-minute city: a new idea of urban spaces and mobility, more connected through proximity and walkability systems. The spaces of this sustainable urban vision are door front spaces located on the ground floors of buildings, too often intended only for commerce, which instead could be regenerated, reused and rehabilitated, through a return to the community. These are indoor and outdoor spaces on the ground floor, able to activate processes of accessibility, but also inclusiveness. Their activities, able to generate also new communities can be temporary and flexible, making them also suitable to host activities in support of emergency conditions. Methods The workshop deals with a portion of the city, with a diameter of 15 minutes, and it moves a design process from the scale 1:200 to the scale 1:5. There are 4 modules organized according to the scale and themes to be explored: Module 1: A sensorial and temporal analysis is conducted on area to identify new design programs, design tools, other values of beauty. This phase provides: concept; sensory diagrams, chronotypes, etc. Module 1 defines the KPIs that will be used to evaluate each project (each group will choose at least 3). Module 1 works on the scale, 1:200, 1:100 Module 2: Downstream of the exploration and analysis process, a ground floor location will be identified on which to carry ...