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 shifting is also prevented. You need one base module for each vertical unit. The base module has a top and bottom and is always used as the top module. With the desired number of extension modules, the height can be expanded modularly. The base module can be used as a standalone piece of furniture, while the extension module cannot.