Poetry predates the written word, making it one of the oldest forms of art. The earliest poems were likely composed to help their creators remember information. Poetry as a genre became more and more structured over time, though in the last century poetry has become more loose and playful. Authors who are best known for other genres often try their hand at poetry, and these works make delightful additions to single-author collections. But the genre of poetry is itself a marvelous collecting interest.