"I haven't seen anything that looks familiar", David said to Geena
J. Patrick Lewis is speaking about 9/11, a terrorist attack which destroyed the World Trade Center Towers, more commonly known as the Twin Towers, and killed many people with it. In this part of the poem, the Empire State Building is the 'narrator'. He's saying that he's lonely because his 'big twin brothers' have died.
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Orthodoxy is probably more flexible, because it is a theory or doctrine that is accepted as generally true, where dogma is viewed as unequivocally true. Although both are laid down by an authority institution, group or figure, one is inherently a bit more flexible than the other..
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... the man, he turned out to be a crazy serial killer.