How can we say that the Chinese metal workers were masters in their art?

The following points illustrate that the Chinese metal workers were masters in their art:

1. They produced magnificent vases, cups, bronze daggers, axes, bows and arrows.
2. The Chinese made a number of ritual vessels of bronze. These included containers for food, wine and water to be kept in tombs for the dead.
3. A large horse, over a metre high, made of bronze has been discovered.