Clay has been used for thousands of years by humans and the overall methods haven’t changed much. Archaeological digs indicate that clay has been used by humans as early as 30,000 years ago. Clay was commonly used to make figurines and bowls or other such containers. Until recent times most of the technological change in clay manufacturing came from the firing process. Ancient clay was first tired using open fires preventing temperatures from getting too hot, once covered fires were used clay was able to be fired at much higher and consistent levels improving the quality.