Buddha Head A1  . Terracotta clay is easy to sculpt into all sorts of shapes. Once shaped, it’s heated to 1,000-2,000° F to harden. Then, a simple coat of glaze can make terracotta watertight.Terracotta has been around for a long time. In fact, it was the only clay product used until around the 14th century. Archeologists have found terracotta sculptures that are 5,000 years old!