Sonnet 130

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 …

…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.