Forme del coinvolgimento. Modificazione condivisa dello spazio pubblico e pratiche di ibridazione.

The investigation identifies its problematic field in the public space, “synecdoche of the urban dimension” and considers the project, understood as a poetic, poietic and political act, in the perspective of the engagement of citizens. A triangulation in which the production of urban space as a social and collective act is also reflected in architectural practice; a “doing with” that can be evoked through the “poetic of with”: to co-conceive, co-design, co-build, co-manage, hybrid practices which contemplate a multiplicity of actors, processes and tools. The theoretical hypothesis identifies in these practices the coexistence of three knowledge: expert, common and political. This convergence feeds projects characterized by a potential persistence of engagement and to do this it refers to the double nature of form: digital and physical form. With the same potential of digital dynamics, also the physical form can accept and promote modifications capable of address the inclusion of the inhabitants towards prolonged temporalities in an incremental, adaptive, polyvalent and non-linear way. The research methodology assumes a hypothetical-deductive investigation system, with an interpretative-comparative approach and an experimental-operational approach. The research is structured in two parts: a theoretical corpus and an experimental part of case studies analysis which, starting from the identification and interpretation of some design paradigms, leads to the identification of possible operational practices. The main case study is the project Réinventons nos places!, a rethinking of seven important Parisian squares, characterized by an experimental design approach aimed at collective participation in the conception, design, construction and evolution phases. Two further case studies were also investigated in a complementary manner: El Campo de Cebada in Madrid and Santa Teresa-cantiere aperto in Cagliari.The different nature of the case studies made it necessary to define a relationship matrix for the construction of a broad and comprehensive reasoning framework. Aim and innovative result of the research were the identification and systemisation of multiple scenarios, design practices, and methods of intervention for collective engagement in spatial modification projects.