A blob of glowing orange wobbles on the tip of a pipe. The craftsman pulls the pipe out of the crucible, spins it and splashes water over it. He perches himself up on a ladder, places his mouth near the other end of the pipe and blows. The frail mass at the opposite tip changes shape and loses colour rapidly. The wind in the pipe manipulates the metamorphosis of the blob and soon it takes the form of a glass pitcher. The crafter separates the pitcher from the pipe and cuts the excess glass away from it’s mouth. This process of glass making from the 1st century BC is preserved…