Umbra Conceal Shelf, Pack of 3, Silver are sagacious in design offering an intelligent way to store books. The powder coated silver floating book shelves that become invisible behind stack of books, transforming the books into a work of art. Mounting hardware included. Turn your storage shelving into a work of wall art. Maximum weight 6.8 kg per shelf. Pratt Institute 2006 Winner. Packaged as a set of three Floating book shelves that become invisible behind a stack of books.