Architecturally graphic yet light and airy, Petra revamps whole-home storage to suit your space and wow your walls. Ebonized oak shelving abounds in this configuration of two narrow six-shelf bookcases that stagger five shelves between them. Iron tubing with a blackened acid-patina finish fashions the slim frames that anchor to the wall. Offset and minimalist, Petra updates mid-century wall systems for a look that's distinctly contemporary and truly room-transforming.