Way cool - a poem not to be easily found on the internet sites (at least with a quick search by me just now). Some notes here:
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classweb.gmu.edu]
For some reason, the rhythm/meter reminds me of the sort of controlled rambling to be found in Preludes, or even Prufrock.
Anyway, it should be safe to decide personally what the message is, then wing it for four pages, knowing one cannot easily be proved wrong. More than likely one will be graded on the strength of any given presentation rather than whether that interpretation is the 'correct' one.
Things to consider:
Meter - varied with pentameter, tetrameter and dimeter lines, endings masculine and feminine mixed
Some lines end stopped, some with enjambment
Find examples of assonance, consonance and alliteration
Rhymes varied, some couplets, some greatly separated, some not paired at all
Punctuation - some sentences short & sweet, some wander on aimlessly
How does it flow off the tongue? Read it out loud and praise or attack the choices made.
Repetition of the imagination's quatrains - this must be the message TSE wants to impart, and the filler lines merely examples? Is the poem itself an example of the chosen theme? Is is self referencing, that is.