Read the following Shakespearean sonnet.
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 damasked, red and white,
But no such roses see I in her cheeks;And in some perfumes is there more delight
Than in the breath that from my mistress reeks.
I love to hear her speak, yet well I know
That music hath a far more pleasing sound;
I grant I never saw a goddess go;
My mistress when she walks treads on the ground.
And yet, by heaven, I think my love as rare
As any she belied with false compare.
The lines "I love to hear her speak, yet well I know / That music hath a far more pleasing sound; / I grant I never saw a goddess go; / My mistress when she walks treads on the ground" employ a humor device. Identify the device used and discuss its effect on the meaning and tone of the poem.