Cloud began as a question about accumulation. Ronan and Erwan Bouroullec conceived this modular shelving system for Cappellini not as a fixed object but as a structure that grows with use, shaped as much by what it holds as by the space around it. Each unit is formed from white polyethylene through rotational molding, a process that produces hollow, seamless forms with a softness rarely encountered in structural furniture. The individual elements connect via white metal pressure clips and can be oriented horizontally or vertically, allowing compositions to extend across a wall or rise freestanding from the floor. Rotationally molded white polyethylene construction Modular units with horizontal and vertical orientation White metal pressure clips for assembly Suitable for wall-mounted or freestanding configurations The result is something closer to an aerial formation than a conventional bookcase. Each arrangement is a consequence of context, never quite the same twice.