Jùcí, it is an ancient Chinese folk craft since the Song dynasty  -  锯 jù refers to metal, 瓷 cí refers to porcelain - a technique that using a metal nail to staple and repair the broken porcelain, nowadays also for Yixing wares and other clay wares.

In the hands of craftsmen, broken porcelain is repaired, restored, and even re-created, the whole process takes several hours of sophisticated works, then the object is rebirth, and