<span>Both artists used chiaroscuro, or contrast between light and dark.
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The ornament's recurring animal forms, which you can see in this detail, prove the piece was created during the late geometric era of Greek art.
The shapes and sizes of ancient Greek pots & cups, or "vases," as they are more well known, varied (see above), and frequently a vessel's design corresponds with its intended use.
For instance, during a Greek symposium, the krater was used to combine wine and water (an all-male drinking party). It allows one to readily access the mixture with a separate ladle and small jug after pouring liquids into its large hole and stirring the combination in its deep basin.
To learn more about the late geometric period of greek art, use the link below.
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Was: Wilhelm Valentiner was born at Karlsruhe (Baden), and studied at Heidelberg under Henry Thode, and in the Netherlands with Cornelis Hofstede de Groot and with Abraham Bredius
Why: In 1906 he published his dissertation on Rembrandt that he started in 1904: Rembrandt auf der Lateinschule.