In the thousand years covered by this volume the shih reached its
highest level of development. A lyric form which, using a predominantly
four-character line, had earlier been employed in the Confucian Book of
Odes, it rose to prominence once more in the period under discussion.
The new shih, which differed from the original form only in its use of
a five- or seven-character line, became the best known and most
characteristic of Chinese poetic forms.