The Shang had sculptures in stone, an art which later more or less completely disappeared and which was resuscitated only in post-Christian times under the influence of Indian Buddhism. Yet, Shang culture cannot well be called a "megalithic" culture. Bronze implements and especially bronze vessels were cast in the town. We even know the trade marks of some famous bronze founders. The bronze weapons are still similar to those from Siberia, and are often ornamented in the so-called "animal style", which was used among all the nomad peoples between the Ordos region and Siberia until the beginning of the Christian era. On the other hand, the famous bronze vessels are more of southern type, and reveal an advanced technique that has scarcely been excelled since. There can be no doubt that the bronze vessels were used for religious service and not for everyday life. For everyday use there were earthenware vessels. Even in the middle of the first millennium B.C., bronze was exceedingly dear, as we know from the records of prices. China has always suffered from scarcity of metal. For that reason metal was accumulated as capital, entailing a further rise in prices; when prices had reached a sufficient height, the stocks were thrown on the market and prices fell again. Later, when there was a metal coinage, this cycle of inflation and deflation became still clearer. The metal coinage was of its full nominal value, so that it was possible to coin money by melting down bronze implements. As the money in circulation was increased in this way, the value of the currency fell. Then it paid to turn coin into metal implements. This once more reduced the money in circulation and increased the value of the remaining coinage. Thus through the whole course of Chinese history the scarcity of metal and insufficiency of production of metal continually produced extensive fluctuations of the stocks and the value of metal, amounting virtually to an economic law in China. Consequently metal implements were never universally in use, and vessels were always of earthenware, with the further result of the early invention of porcelain. Porcelain vessels have many of the qualities of metal ones, but are cheaper. The earthenware vessels used in this period are in many cases already very near to porcelain: there was a pottery of a brilliant white, lacking only the glaze which would have made it into porcelain. Patterns were stamped on the surface, often resembling the patterns on bronze articles. This ware was used only for formal, ceremonial purposes. For daily use there was also a perfectly simple grey pottery.