As midnight black, as twilight brown, they spread,
But feathered thick with flame that streaked and lined
Their living darkness, ominous else of dread,
From south to northmost verge of heaven inclined
Most like some giant angel's, whose bent head
Bowed earthward, as with message for mankind
Of doom or benediction to be shed
From passage of his presence. Far behind,
Even while they seemed to close,
Stoop, and take flight, arose
Above them, higher than heavenliest thought may find
In light or night supreme
Of vision or of dream,
Immeasurable of men's eyes or mounting mind,
Heaven, manifest in manifold
Light of pure pallid amber, cheered with fire of gold.