Metrical patterns, also known as RHYTHMS, are a form of poetic structure that uses a specific pattern of stressed and unstressed syllables to create a particular sound. This sound is often used to create a musical effect in poetry, and is an important part of the overall structure of a poem. RHYTHMS can be used to create a sense of movement or to emphasize certain words or phrases. They are also used to create a sense of unity within a poem, as well as to create a sense of tension or suspense.