What is the author's style in A Far Cry from Africa by Derek Walcott?

"A Far Cry from Africa" contains four stanzas of mostly iambic tetrameter. Actually, the poem starts off in iambic pentameter, the prevalent form of poetry written in English, but it soon veers off course metrically—a change that reflects the changing scene and perspective in the poem—with lines of varying length and number of stresses.