My mistress' eyes are nothing like the sun;Coral is far more red than her lips' red;If snow be white, why then her breasts are dun;If hairs be wires, black wires grow on her head.I have seen roses damask'd, red and white,But no such roses see I in her cheeks;And in some perfumes is there more delightThan in the breath that from my mistress reeks.I love to hear her …showed first 75 words of 739 total…

…showed last 75 words of 739 total…the whole poem some part of his mistress is like. In the second and third quatrains, he expands the descriptions to occupy two lines each, so that roses/cheeks, perfume/breath, music/voice, and goddess/mistress each receive a pair of unrhymed lines. This creates the effect of an expanding and developing argument, and neatly prevents the poem--which does, after all, rely on a single kind of joke for its first twelve lines--from becoming stagnant.