Tojo High-Stacker Shelf System. This high-stacker by Dirk Frömchen for Tojo Furniture lives up to its unassuming name, as it is a brilliantly simple (almost) infinitely expandable system for storing books, files, and display items. And all this without screws, drilling, or other bothersome manual tasks. For vertical stacking, primarily extension elements are used - two side panels with a shelf. The top is finished with a cuboid base element that has a bottom and a smooth, flat lid. The distinctly milled sides give the shelf a unique appearance, but they primarily serve to provide a stable connection between the loosely stacked individual elements. The bottom of an element is secured in such a way that it prevents lateral shifting of the element placed on top.