A visit open to the public in the context of the colloquium ‘Closed communities, between residential innovation and fortification’. Three themes will be discussed in situ: to govern a cross-border space, to reconstruct the city upon the city, to produce urban quality. The program: presentation of the Franco-valdo-genevan agglomeration project; visit of the project Praille-Acacias-Vernets, the Eaux-Vives beach, the îlot 13.