IOS is a composable bookcase system with the possibility of 7 widths, 7 heights and 2 depths. It can be projected on the floor, bifacial on the floor or suspended. Starting from some separators and modules, it allows us to build a basic structure to which we can add different accessories: hinged doors, botom hung doors, top hung doors, sliding doors, drawers or decorative cubes that stand out and provide a new volume. IOS gives shape to any functional and aesthetic need, from the classic bookcase to the TV room furniture, work area or auxiliary furniture.