The craft is joint: engineers, engineers, and fabricators repeat on prototypes, refining joints, coatings

https://codynucp768.theglensecret.com/dormers-without-doubt-the-100-year-performance-of-hand-fabricated-copper

The craft is collaborative: architects, designers, and producers repeat on prototypes, refining joints, surfaces, and tolerances until sophisticated concepts end up being buildable steel.