Offers training courses in natural construction techniques, and writes publications related to Cob building techniques. Cob building uses hands and feet to form lumps of earth mixed with sand and straw, a sensory and aesthetic experience similar to sculpting with clay. Cob is easy to learn and inexpensive to build. Because there are no forms, ramming, cement or rectilinear bricks, cob lends itself to organic shapes: curved walls, arches and niches. Earth homes are cool in summer, warm in winter. Cob's resistance to rain and cold makes it ideally suited to cold climates like the Pacific Northwest, and to desert conditions.