You may already have seen one of these videos showing how traditional houses are built without the need for nails. If you didn’t, I suggest you take a look at this article on the Interesting Engineering blog. The pieces used to build those houses without nails have their ending looking like puzzle pieces, they are assembled together and hold very good.
For his Yose-gi stool, Brooklyn-based Japanese product designer Yoshiaki Ito found his inspiration in these traditional elements. The founder of TAMEN, his design studio, made stools that can be assembled together in order to save space when the stools are not in use.