One day while studying a Yeats poem I decided to write poetry the rest of my life. I recognized that a single short poem has room for history, music, psychology, religious thought, mood, occult speculation, character, and events of one's own life. I still feel surprised that such various substances can find shelter and nourishment in a poem. A poem in fact may be a sort of nourishing liquid, such as one uses to keep an amoeba alive. If prepared right, a poem can keep an image or a thought or insights on history or the psyche alive for years, as well as our desires and airy impulses.