The Equipment used nowadays in cabinet-making and joinery is both complex and staggeringly expensive. Sixty years ago, a carpenter would laboriously cut out a tenon from one piece of wood to be joined to another, and drill out a hole in the other (the mortise). Then "biscuits" came along - pre-formed pieces of wood which fitted into mortises matching on both pieces of wood. Now, thanks to a German company Festool, there are "dominos", floating tenons, made of hardwood, which are basically very much longer and stronger "biscuits", which fit into pre-cut mortises, using a Festool, which retail at about £1,200! Here is an example of where oak dominos are being used to construct the frame of a new walled garden door made of seasoned Douglas Fir. They are shown lying on the frame where they will be inserted and glued in place in the final assembly. (https://en.wikipedia.org/wiki/Domino_joiner
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