This interesting and rather witty idea was submitted by Rome based design studio Rota-Lab. While working on a private project and facing a space challenge, the designers came up with this concept – incorporate storage into the bathroom door. “We thought we could use the door’s volume, adding some built in boxes, to contain stuff that would otherwise occupy other surfaces,” – they explain. From the outside the door looks rather unusual and sculpturesque, which is a beautiful side effect of this design.