This is a divination cup, which has been the subject of many poems and myths of ancient Persia. It is believed to have been discovered while digging in the foundations of Persepolis, filled with the elixir of immortality. In this magical cup was mirrored the whole world, and everything, good and evil, was revealed therein. The Persians put great faith in these revelations; and attributed the prosperity of their empire to the possession of this famous cup. A.G.H.
Source: 81, 129.