Poetry have challenged the traditional definitions of the sonnet form, rendering entire sequences of "sonnets" that often lack rhyme, a clear logical progression, or even a consistent count of fourteen lines. "Shi" () Is the main type of Classical Chinese poetry. Within this form of poetry the most important variations are "folk song" styled verse ("yuefu"), "old style" verse ("gushi"), "modern style" verse ("jintishi"). In all cases, rhyming is obligatory. The Yuefu is a folk ballad or a poem written in the folk ballad style, and the number of lines and the length of the lines could be irregular. For the
Sonnet 2 child and thereby protect himself from reproach by preserving his beauty against Time's destruction. Sonnet 2 begins with a military siege metaphor, something that occurs often in sonnets and poetry — from Virgil (‘he ploughs the brow with furrows’) and Ovid (‘furrows which may plough your body will come already’) to Shakespeare’s contemporary, Drayton, “The time-plow’d furrows in thy fairest field.” The image is used here as a metaphor for a wrinkled brow. Trenches are also carved into a field when a farmer plows, and the agricultural connotation is touched on two lines later with the image of worthless weeds.