In this period of absence from office messages, we propose a journey through the steps of artists who invest vacant areas, move the cadres, the time and place usually devoted to artistic work. Acting more or less officially, these artists temporarily occupy empty spaces, borrow functions, infiltrate the interstices, reveal unknowns and fill gaps. Whether they are playful, formal, experimental, theoretical or physical, their interventions - which are not necessarily destined to be public, nor even to be an artwork - explore possibilities, challenge usages and push the limits of their investigative environments.