The type of pottery which developed throughout the Greek world during the Archaic and Classical periods. Patterns were Geometric on early pieces (c.900–c.700 bc); gradually figures were introduced on a black ground. This black-figure painting gave way to the more naturalistic red-figure style. The Greeks introduced a range of conventional pottery shapes, many of which have continued in use until the present day. They were usually made for a specific purpose, such as the amphora for wine, hydria for water, and kylix, a drinking cup.