The craft is joint: engineers, engineers, and producers repeat on prototypes, refining joints, finishes

https://wiki-net.win/index.php/Roofing_Vent_Resilience:_Copper_Elements_That_Outlive_the_Building_Code_Cycle

The craft is joint: designers, designers, and fabricators iterate on prototypes, refining joints, finishes, and tolerances until sophisticated ideas become buildable steel.