"there is this poetry. There is this science. The farther along the way we go in each, the more clearly the relationship may be perceived, the more prodigal the gifts. The definitions of Western culture have, classically, separated these two disciplines. When Darwin wrote of Humboldt that he displayed the rare union between poetry and science, he set the man in a line of heroes of that meeting-place-a line which includes Lucretius and Goethe and Leonardo, but which for the last centuries has been obscured in the critical structure which insists that the forms of imagination are not only separate, but exclusive."