About the origins of Anglo-American poetic modernism, one thing is certain: it started with a notion of the image, described variously by Ezra Pound as an ideogram and a vortex. We have reason to be less confident, however, about the relation between these puzzling conceptions of the image and the doctrine of literary positivism that is generally held to be the most important legacy of Imagism. No satisfactory account exists, moreover, of what...