These fields were usually enclosed with a hedge to keep animals from eating the crop and to define the territory of the settlement from that of its neighbors. Flax was grown and made into linen cloth. Beyond the fields were pastures for cattle and sheep grazing. There was often an area for beehives. This was subsistence level farming. Pottery was given symmetry when formed with use of a wheel and heated in increasingly hot kilns. From kilns used for pottery, it was noticed that lumps of gold or copper ore within would melt and assume the shape of what they had been resting on. These were the first metals, and could be beaten into various shapes, such as ornaments. Then the liquid ore was poured into moulds carved out of stones to make axes [small pointed tool for piercing holes in leather, wood, or other soft materials] and daggers, which were reheated and hammered to become strong. Copper-tipped drills, chisels, punches and awls were also made. The bodies of deceased were buried far away from any village in wood coffins, except for kings, who were placed in large stone coffins after being wrapped in linen. Buried with them were a few personal items, such as copper daggers, flat copper axes, and awls. The deceased was buried in a coffin with a stone on top deep in the earth to keep the spirit of the dead from coming out to haunt the living. It was learned that tin added to the copper made a stronger metal: bronze. Stone hammers, and bronze and iron tools, were used to make cooking pots, weapons, breast plates, and horse bits, which were formed from moulds and/or forged by bronze smiths and blacksmiths from iron extracted from iron ore heated in bowl- shaped hearths. Typically one man operated the bellows to keep the fire hot while another did the hammering. Bronze was made into sickles for harvesting, razors for shaving, tweezers, straight hair pins, safety pins for clothes, armlets, neck-rings, and mirrors. Weapons included bows and arrows, flint and copper daggers, bronze swords and spears, stone axes, and shields of wood with bronze mountings. The bows and arrows probably evolved from spear throwing rods. Kings in body armor fought with chariots drawn by two horses. The horse harnesses had bronze fittings. The chariots had wood wheels, later with iron rims. When bronze came into use, there was a demand for its constituent parts: copper and tin, which were traded by rafts on waterways and the sea. When iron came into use, there were wrought iron axes, saws, adzes [ax with curved blade used to dress wood], files, ploughshares, harrows [set of spikes to break clods of earth on ploughed land and also to cover seed when sewn], scythes, billhooks [thick knife with hooked point used to prune shrubs], and spits for hearths. Lead was mined. There was some glassmaking of beads. Wrought iron bars were used as currency.