Roulotte (Caravan) is a flexible publishing project which compiles information about projects devised in specific contexts. Roulotte thus becomes a kind of permanently circulating, mobile exhibition. Roulotte has brought out a special issue, devised as a “caravan of caravans”, as part of the project Post-it City. Occasional Urbanities. The result is a sizeable archive of materials featuring works by artists, photographers, architects and researchers who have explored, from very diverse registers, the different models and uses of the mobile home. Roulotte # 4 takes an unusual approach to the nomadic experience understood as a variable of the post-it city phenomenon. Much of the material in the collection was recorded in areas close to Barcelona.