Small pieces of redwood trunk are sold as souvenirs termed redwood burls. Bosses fringed with shoots are burrs, whereas unfringed bosses are burls. Redwood burls are used in the production of table tops, veneers, and turned goods. Many trees have burls bumps, and knots along their trunk. Briar burls are cut into two types of blocks; ebauchon and plateaux. Causes including fungus, burls, stress, knots, special grain alignments, and others produce figure in wood. Burwash Landing is known for its black spruce burls. While coming from any kind of wood, burls from "Phoebe" trees are the most common. When provoked by damage, dormant buds in the burls sprout new shoots and roots. In some tree species, burls can grow to great size. Clear sections of trunk are selected so as to not include branch collars, burls, etc. In contrast, burls were widely available in the virgin forests of North America. Jack Harvey, Bob Burls and Jack Kinsley all chose early retirement. The world's second-largest burls can be found in Port McNeill, British Columbia. Burls start as an irritation in the spruce.