Terracotta Army
It is thought their legs were made the same way that terracotta drainage pipes were made at the time. This would make it an assembly line production, with specific parts manufactured and assembled after being fired, as opposed to crafting one solid piece and subsequently firing it. In those times, each workshop had to write its name on items produced. Once they were completed, the terracotta figures were placed in the pits in precise military formation according to rank and duty.