The mortise and tenon joint has been used for thousands of years by woodworkers around the world to join pieces of wood. In its basic form it is both simple and strong. Although there are many joint variations, the basic mortise and tenon comprises two components: the mortise hole and the tenon tongue. The tenon, formed on the end of a member generally referred to as a rail, is inserted into a square or rectangular hole cut into the corresponding member. The tenon is cut to fit the mortise hole exactly and usually has shoulders that seat when the joint fully enters the mortise hole. Wikipedia
The mortise & tenon has been used reliably for over 7000 years. Done well, a mortise & tenon can be a beautiful and easy way to get an important job done. It is no mistake that we used this metaphor for our company and our products.