The distinctly milled sides give the furniture its unmistakable appearance and primarily serve to connect the segments to each other. By attaching the base slightly below the milling, lateral slipping is also prevented. The stacker is made of melamine-coated MDF. For each vertical unit, you need a base module. The base module has a top and bottom and is always used as the top module. With the desired number of extension modules, you can modularly expand to the desired height as needed. The base module can be used as a standalone piece of furniture, but the extension module cannot.