The first line is the DNA of the poem; the rest of the poem is constructed out of that first line. A lot of it has to do with tone because tone is the key signature for the poem. The basis of trust for a reader used to be meter and end-rhyme.
I moved to New Zealand from Winnipeg when I was almost five. I hated it. It was to a city in the south of New Zealand called Invercargill and there was constant rain. There was a depressing sensation in the air.