[Andrenekoi]

Poetry (from the Greek "ποίησις", poiesis, a "making") is a form of literary art in which language is used for its aesthetic and evocative qualities in addition to, or in lieu of, its apparent meaning. Poetry may be written independently, as discrete poems, or may occur in conjunction with other arts, as in poetic drama, hymns, lyrics, or prose poetry.

Poetry, and discussions of it, have a long history. Early attempts to define poetry, such as Aristotle's Poetics, focused on the uses of speech in rhetoric, drama, song, and comedy.[1] Later attempts concentrated on features such as repetition, verse form and rhyme, and emphasized the aesthetics which distinguish poetry from prose.[2] From the mid-20th century, poetry has sometimes been more loosely defined as a fundamental creative act using language

Poetry often uses particular forms and conventions to suggest alternative meanings in the words, or to evoke emotional or sensual responses. Devices such as assonance, alliteration, onomatopoeia, and rhythm are sometimes used to achieve musical or incantatory effects. The use of ambiguity, symbolism, irony, and other stylistic elements of poetic diction often leaves a poem open to multiple interpretations. Similarly, metaphor, simile, and metonymy[4] create a resonance between otherwise disparate images—a layering of meanings, forming connections previously not perceived. Kindred forms of resonance may exist, between individual verses, in their patterns of rhyme or rhythm.

po⋅et⋅ry
  /ˈpoʊɪtri/ Show Spelled Pronunciation [poh-i-tree] Show IPA
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–noun
1. the art of rhythmical composition, written or spoken, for exciting pleasure by beautiful, imaginative, or elevated thoughts.

IMO Utada does this. If it is deep or not, it's up to personal opinion, while IMO her work can be really deep or really dull depending on the song... She is not on japanese school books by accident... If I offended u with what I said abou Ayu's lyrics, sorry, it wan't my intention, and as I said, that was an opinion.
But still... IMO the biggest point on Ayu's lyrics is that it's very easy to relate to them, what IMO and ON THE WAY I SEE BOTH AYU'S AND HIKKI'S WORK doesn't mean that one is a better songwritter than the other, just that they have different focus, and good enough for them, both archieve sucess