They used tools made of stone and wood. Some jewellery features beads made from crystals, glass, stone, wood and bones. This utilizes simple equipment made of wood and stone. There is also a notable pine wood at Castelfusano, near Ostia. Romans used rectangular fortresses built out of wood and stone. Concrete walls leak air far less than those made of wood frames. The psalmist described idols as being made of gold, silver, wood, and stone. Used for cutting and shaping wood or other materials. They are made out of hard wood or hard rubber. It was protected by a ditch surmounted by a wall of mud brick and wood. Brown is the color of dark wood or rich soil. They discovered a secret compartment in the floor containing an ancient wood and brass chest. Barbecuing is usually done outdoors by smoking meat over wood or charcoal. The shacks were small and built with damp, green wood. The hardness of wood varies with the direction of the wood grain.