Metre (poetry) of over some two-and-a-half millennia. Beginning with the earlier recorded forms: the Classic of Poetry tends toward couplets of four-character lines, grouped in rhymed quatrains; and, the Chuci follows this to some extent, but moves toward variations in line length. Han Dynasty poetry tended towards the variable line-length forms of the folk ballads and the Music Bureau yuefu. Jian'an poetry, Six Dynasties poetry, and Tang Dynasty poetry tend towards a poetic metre based on fixed-length lines of five, seven, (or, more rarely six) characters/verbal units tended to predominate, generally in couplet/quatrain-based forms, of various total verse lengths. The Song poetry
Of Modern Poetry is ongoing. These non-sentences also stress that the mind must act, not passively wait for inspiration or intuition. And the mind must seek to find "what will suffice." What that says of modern poetry will be addressed metaphorically in the poem, the organizing metaphor being that of a new stage on which the modern poet will perform. The lines of the poem, non-traditional "free verse," do not rhyme and are not metrical. They range from ten syllables to fourteen. One striking thing about the sounds of the poem is that three of the lines have weak endings; that is, the