''A distinction is made among those who encounter this art: some are true, some insubstantial, some incomprehending. It is like this: several ceramic amphoras receive one crop of expensive wine from one farm. After a time, some of the amphoras give the wine back perfect, filled with flavor and enjoyment for those who entrusted the wine to their keeping. Other amphoras, however, allow the measure of the wine's volume to diminish, are not able to contain the new wine, and allow it to foam over - these amphoras did not alter the flavor or cause the savor of the wine crop to disappear, but they do cheat <the vintner> in both respects, for the taste does not last any time nor does it keep its real nature, but immediately changes.'' - Valens, V. Anthologia. Translated by Mark Riley.