Wool from sheep has long been a basis for making cloth around the world. Sheep are generally hardy and easy to keep. They have been part of the supply chain for cloth and food for millennia. Wool has long been made into cloth. Some of it is made into yarn for knitting and crocheting. Occasionally it is used to sew. When making a design with wool yarn, it is called crewel or crewelwork. Many home artists have spent long winter days and evenings making beautiful pieces in this craft form. While considered a craft, it has produced many pieces that have been cherished as art by generations of families.