Astonishingly deft poems that highlight an excess, an emptiness, and a wilderness on the other side of use. In Unidentified Poetic Object, his twelfth collection of poetry, Brian Henderson strikes from language an "alphabet of lightning," an animacy and urgency in which every object is potent with actions, past and present; every action is alive with the potential of what it might move in the world. And since every object is more than we know in our eagerness to turn it to human use, Henderson wants us to dive into that unknown space.