Near and Far (Blunden)/Inland Sea

Inland Sea
  Here in the moonlit sea,
While swift we fly, while tranced we gaze,
The fishers wind their ancient ways:
Now like sea-lilies loom their luring sails,
Or heaven's envoys walking fountained vales;
  And now by one deflection dark,
  Like waiting vultures of the night
Each pirate blackness skulks, a murderous mark
  Begotten by a thing of light,
Like apprehension's baffling destiny.