Demon Shelf, designed by Mathieu Matégot for Gubi. The Shelf Series Demon is available in several different configurations that can be customized suited for all homes and spaces where that extra dimension of aesthetics for wall storage is sought for. In Mategot's original sketches, the shelf was named Biblio-Démon, and was part of his plan to create a home library. The black lacquered gables are permanent while the shelves are available in several widths and different wood types. Choose between three, four or five shelves.