The Greeks always diluted their wine with water. It was the privilege of the symposiarch, who acted as master of ceremonies at a drinking party, to decide the proportion of wine to water in each krater (bowl for mixing wine and water) as the evening progressed. On this water jar, two armed youths perform a dance to flute music. Such dances imitating the motions of warfare were popular at festivals throughout Greece. The term kalpis refers to a hydria of this particular shape.
Richter, Gisela M. A., Marjorie J. Milne, and The Metropolitan Museum of Art. 1922. Shapes of Greek Vases. New York.
Richter, Gisela M. A. 1923. "Athenian Pottery: Recent Accessions." Bulletin of the Metropolitan Museum of Art, 18(11): pp. 253–55, fig. 3.
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Richter, Gisela M. A. and Marjorie J. Milne. 1935. Shapes and Names of Athenian Vases. p. 12, figs. 81-82, New York: Plantin Press.
Beazley, John D. 1963. Attic Red-figure Vase-painters, Vols. 1 and 2, 2nd ed. pp. 34, 1621, no. 14, Add. 1, pp. 33-35, Oxford: Clarendon Press.
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