Analysis of Monition

A faint wind, blowing from World's End,
     Made strange the city street.
   A strange sound mingled in the fall
     Of the familiar feet.
   Something unseen whirled with the leaves
     To tap on door and sill.
   Something unknown went whispering by
     Even when the wind was still.
   And men looked up with startled eyes
    And hurried on their way,
  As if they had been called, and told
    How brief their day.