The FabCity model, shared public space, is an alternative model of social innovation that aims to involve citizens in local production by relying on the dynamics generated by third places. This project is based on a reflection on the production of urban commons in the public space (here a skatepark), establishing a cross dynamic of cooperation between the local community, the citizen contribution, and the private actors. This experimentation through this common operation, and visible to all, shows that the establishment of the circular economy in a territory can also be the result of a process of contributory democracy and new forms of governance in public policies. The objective of this article is to present the methodology deployed, the local loop of actors created, whose epicenter is the Lezoux Media Library. Through this experiment, we show and describe new forms of innovation in the territories, driven by the FabCity dynamic, with the center of gravity of the contributory dimension of citizens, including a real plurality of actors in design and decision-making.