La Friche La Belle de Mai is the leader of the project. La Friche, in its prototypal form, arose in 1992 out of the new models for urban cultural interaction in the public interest, now known as “third places.” This unique, reinvented space brings together artistic activity, modes of urban transformation, real connections to the region, and dynamic cooperation. La Friche is both a workspace for 70 resident organizations representing all creative disciplines (400 artists, producers, and employees work here every day), and a cross-disciplinary venue (each year, over 600 artistic events are made available to the public). Every year, 450,000 visitors come to this 45,000 square-meter public space housing five performance spaces, a community garden, a playground and athletic space, a restaurant, bookstore, daycare, some 2,400 square meters of exhibition space, an 8,000 square-meter rooftop, and a training center. Thanks not only to its size but also to the number and variety of spaces, La Friche provides workspace to artists, in addition to allowing numerous projects to develop at the same time. Sculptors, actors, painters, photographers, dancers, and producers can have the time and space they need for writing and creating. With their year-round presence and creative activity, these residents, called “frichistes,” form the living artistic hub that has been an essential part of La Friche since its conception. Here, art and culture are brought into existence, shared, and enjoyed. But like any neighborhood, La Friche invites us to wander its streets, hang out in its public spaces, have a bite or a drink, drop off the kids at daycare or take them to the playground, buy fruit and vegetables at the Monday farmers market, or even dig a bed in the community garden. It’s not a coincidence that La Friche adopted the name of La Belle de Mai, the larger neighborhood surrounding it. Neighborhood youth feel welcome in the spaces that are open seven days a week, and the youngest Belle de Mai residents even have daycare. La Friche opened the cinema Le Gyptis in 2014, which has since become a pillar of the neighborhood, and people from Belle de Mai and beyond feel at home in its many open spaces. Marseille has seen recent major problems of space management, with deadly collapses of dilapidated buildings, and the city has very important regeneration plans. The intervention is planned for abandoned spaces in the neighborhood of La Belle de Mai where La Friche is located, in the city centre. They are in a derelict state and contribute badly to the residents’ well-being. The approach on Commoning will aim at creating citizen-led processes, fostering citizens participation and a form of renewed collective ownership of the area, whilst exploring positive applications of the Nudge theory.