How did Dylan do it?

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"...sloeblack, slow, black, crowblack, fishingboat-bobbing sea..." 

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Those opening words of Under Milk Wood, the masterpiece radio play by Dylan Thomas, are quite magical. Not only do they create a vivid, vibrant mental image, but the words alone - their rhymes, their rhythms, their alliterations - are linguistic perfection. How did Dylan do it? Well, perhaps like this...

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