this wall-mounted bookshelf holds a marble-run in the front edge and, when a book is removed and the balance upset, it see-saws and the marbles glide down to the other endyes, it’s a novelty bookshelf but importantly (at least for me) it is still a perfectly functional bookshelf which doesn’t damage your books!made to order to your dimensions (length/depth/height) and with the marbles of your choice.
