The document discusses different natural building techniques using straw, cob, and light clay. It provides a brief history of straw bale construction in the 1800s Nebraska and describes how straw bales are used to form insulating and durable load-bearing walls. Cob construction is summarized as a mixture of clay, sand, straw and water used to create freeform walls that are structurally stable. Light clay techniques are also outlined as a German tradition of filling wood frames with straw or other materials coated in clay slip.