Manuel Welsky, a German designer, proposes a simple fix: a stool that can be raised and lowered with a twist of its cork seat. SCRW is made up of two parts: a threaded cork cylinder and a frame of steel tubing.
Stool by Dmitry Kutlayev, via Behance has six peaces off wood all slotted together, well maybe the legs are joint by dowels or it could be a lap joint or a miter with wood spline, or just slots in general.
The “Hockerbank” meaning stool-bench designed by Johanna Dehio was inspired by makeshift seating. This series consists of several stools that are supplemented by a plank with round cut outs and round tables which can also be transformed into a long table.