Lesezeichen-das modulare Buchregal in German means Bookmark – the modular bookshelf! The modularly expandable bookshelf from undpartner lets you store your books in an incredible way. How? It’s a bookshelf that is expandable enough to suit your needs. Easy to assemble and dismantle, extended freely in space or on the wall up, portable enough to taken from one room to another, this bookshelf gives you the freedom to expand it as you keep adding to your great collection of books!