Intro -- Preface. Open City -- Introduction. Post-Industrial Cities -- FRAMING (contexts). Eibar: Life and death of an industrial district -- SHARING (interview). Conversation with Momoyo Kaijima -- RESEARCHING (theory). Hypotheses on Urban Shrinkage in the 21st Century. Shrinking Cities. Concepts for action -- LEARNING (methodology and production). Eibar. Roles and collaborative models -- FRAMING (contexts). Fuenlabradas Cobo Calleja. Chinese Enclaves in Spanish Cities -- SHARING (interview). Conversation with Juan Herreros -- RESEARCHING (theory). Potteries Thinkbelt. Atmospheres and Sensus Communi -- LEARNING (methodology and production). Cobo Calleja. Collaborative design strategies -- FRAMING (contexts). Invention and assembly of the technical object -- SHARING (interview). Conversation with Andres Jaque, Maria Langarita and Victor Navarro -- RESEARCHING (theory). MiLL, SHoP, SHeD -- LEARNING (methodology and production). Disassembly and reassembly.