Why did bradybury choose those two stanzas?

The sea of faith 
was once too at the full and round earths store
lay like the folds of a bright girdle furled
but now i only hear
its melancholy long withdrawing roar
reatreting with the breath
of the night wind down the vast edges dear
and naked shingles of the world

Is there supposed to be an image with this question?

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