Stradivari
Violins These are the most famous and rare violins in the world, and that’s for a very good reason. No one knows how these violins make their unique resonance. The technique for building Stradivari instruments was a family secret known only by patriarch Antonio Stradivari and his sons, Omobono and Francesco. Once they died, the process died with them, but this hasn’t stopped some from trying to reproduce it. Whether it’s a specific wood density or a type of fungus in the materials, it’s an enduring mystery.