This Product Ships Free. The create-your-own library solution is back by popular demand. We’ve received many requests to bring back this Levenger favorite, introduced in 1991, so here it is. At heart, our BookBox is a simple bookcase cube. But the soul of a BookBox is its versatility. Depending on how you stack and arrange the different pieces, they can be long units, tall units, cupboards, collectibles cabinets, even room dividers. They let you create bookcases with more function and beauty than any we know, allowing you to design a library that grows with your collection. Stack two or more units together with the wall mounts included.