Conceal floating book shelf by umbra mounts to the wall and becomes invisible behind a stack of booksConstructed of powder-coated steel; mounting hardware includedSupports up to 15-pound of books; maximum stack height 8-inchSize: 5 by 5 by 5-1/2-inch; fits small to medium booksPatented, award-winning design by miron lior; portion of proceeds donated to pratt institute school of art and design