Come on, poem hunters! Let's not forget the classics. This poem is light, bouyant; that is, until you smack into 'The Child is father of the Man.' A great line that my seventh and eighth graders have fun with.
Yes, I think this is an allegory for creating poetry- a challenge, perhaps, to the pretentious and therefore distant poets of the age. He wrote, 'No ideas but in things.' Poets shoud LOOK at life and describe its beauty-the mind will see so many ideas in it. There's no need for flowery metaphors.
It's hard to say it's one of the greatest poems, but it's certainly one of the most important. Memorize it-it's easy!