law of diminishing returns. A concept in economics that if one factor of production (number of workers, for example) is increased while other factors (machines and workspace, for example) are held constant, the output per unit of the variable factor will eventually diminish.
History of glass. The history of glassmaking can be traced back to 3500 BCE in Mesopotamia, but Mesopotamians may have created second-rate copies of glass objects from Egypt, where this complex craft actually originated. Other archaeological evidence suggests that the first true glass was made in coastal north Syria, Mesopotamia or Egypt.
But in the same lot was a 'famille rose' porcelain libation cup - 18th century, as stated, with pretty scenes of ladies and children. Take in the horn of plenty; ANTIQUES Horn libation cups used by the Chinese were intricately carved pieces, often regarded as magical.