Mortis and Tenon is a traditional woodworking technique used to join two piece of lumber at a 90 degree angle. Among other products, The Joinery uses mortise & tenon joints when building their dining chairs. The photograph above shows a dining chair apron tenon which is being inserted into a mortise on the chair leg.
You can find mortise & tenon joinery used in all sorts of materials including metal, stone, glass, and brick. Mortise & tenon joints have been used for many millenniums. From the obelisks of ancient Egypt to our very own woodshop; mortise and tenons help our ideas take shape.