Form/structure – appearance and sound
Form or structure is a poem’s appearance and how it sounds.
Form is the structure, or pattern, of a poem, including the length of the lines, their rhythms, the rhyming system (if any) and the division of the lines into stanzas or verses.
Formula (form) 1 racing cars certainly look good (appearance).
Formula (form) 1 racing cars are certainly noisy (sound).
They can go over any structure.
Examples of different forms of poetry include: