2 mirrors 5. 5 mirrors 2: this is the motif that inspired us to name our modular bookcase '25/52'. Specifications: 2 elements, 1 vertical upright, lined with holes; 1 metal sheet, folded in order to form three surfaces, which can then be mounted as a '2' or as a '5'. The interstice between the planes of the '25/52' library is 25 cm. If you need more space for taller books, you can increase the distance between the two interconnected modules. This system guarantees absolute liberty in designing the bookcase, adapting it to your personal spaces and your books.