The Conceal wall shelf is a floating bookcase that become invisible once stacked with books. Attach it to your wall (using the included mounting hardware) then slide the sturdy metal shelf between the back cover and pages of a book to create a base for additional books to be stacked upon. Once you’ve secured the back cover into the holding lips, place additional books on top until the sturdy metal shelf is hidden from view. Your books will appear to be floating on the wall!