The form, the physical structure of a poem, refers collectively to line lengths, rhythms and patterns of rhyme. It includes both how the poem looks on the page and how it sounds when read out loud.

John Koethe spent decades as a philosophy professor. The poems in his latest collection, “Cemeteries and Galaxies,” are full ...

Because the poem describes in concrete detail Hughes's hours just before Plath's suicide, it has been called the keystone and the heart of Birthday Letters, even the "missing link" in the collection.