Even if you walk exactly the same route each time - as with a sonnet - the events along the route cannot be imagined to be the same from day to day, as the poet's health, sight, his anticipations, moods, fears, thoughts cannot be the same.
A. R. AmmonsEach poem in becoming generates the laws by which it is generated: extensions of the laws to other poems never completely take.
A. R. Ammons