The renovation turned a former office into a private house. Workstations were hosted in a large room that, according to the client's program, should have to be split in a living room and a study. The room, nevertheless, had beautiful proportions, so the project chose to divide it by four sliding panels, overlapping two by two. All those panels have a mirror face outside and a black backside. They roll along a rail that divides the room into two halves. This trick generates a funny optical effect, so that you can guess the room real dimensions even when the sliding doors are closed.