Analysis of As Watchers hang upon the East

As Watchers hang upon the East,
As Beggars revel at a feast
By savory Fancy spread—
As brooks in deserts babble sweet
On ear too far for the delight,
Heaven beguiles the tired.

As that same watcher, when the East
Opens the lid of Amethyst
And lets the morning go—
That Beggar, when an honored Guest,
Those thirsty lips to flagons pressed,
Heaven to us, if true.