The chief device of ancient Hebrew Biblical poetry , including many of the psalms , was parallelism , a rhetorical structure in which successive lines reflected each other in grammatical structure, sound structure, notional content, or all three. Parallelism lent itself to antiphonal or call-and-response performance, which could also be reinforced by intonation . Thus, Biblical poetry relies much less on metrical feet to create rhythm, but instead creates rhythm based on much larger sound units of lines, phrases and sentences.  Some classical poetry forms, such as Venpa of the Tamil language , had rigid grammars (to the point that they could be expressed as a context-free grammar ) which ensured a rhythm.  In Chinese poetry , tones as well as stresses create rhythm. Classical Chinese poetics identifies four tones : the level tone, rising tone, departing tone, and entering tone . 
And yet his poetry has always stood independent of any context in which he has worked, with a readership looking at the poetry for its own sake. For example, despite having spoken on the issue for over twenty years, he has almost no poetry directly written about the workplace. His work looks at the larger, timeless relationship of human beings to their world, to their relationship with creation, with others or with death. He looks at the sufferings and joys that come with revelations and the necessities of belonging to specific families, peoples and places. His work also chronicles a close relationship to landscapes and histories, especially those of his native Yorkshire, Ireland, Wales and his more recent home in the Pacific Northwest of the United States.