Alexandrine introduce phrasal accentuation, or rigorously observe the medial caesura, as in French." Common usage within the literatures of European languages is broader still, embracing lines syllabic, accentual-syllabic, and (inevitably) stationed ambivalently between the two; lines of 12, 13, or even 14 syllables; lines with obligatory, predominant, and optional caesurae. Although alexandrines occurred in French verse as early as the 12th century, they were slightly looser rhythmically, and vied with the "décasyllabe" and "octosyllabe" for cultural prominence and use in various genres. "The alexandrine came into its own in the middle of the sixteenth century with the poets of the Pléiade
Poetry a rhythm. Classical Chinese poetics, based on the tone system of Middle Chinese, recognized two kinds of tones: the level (平 "píng") tone and the oblique (仄 "zè") tones, a category consisting of the rising (上 "sháng") tone, the departing (去 "qù") tone and the entering (入 "rù") tone. Certain forms of poetry placed contraints on which syllables were required to be level and which oblique. The formal patterns of meter used in Modern English verse to create rhythm no longer dominate contemporary English poetry. In the case of free verse, rhythm is often organized based on looser units of