I want to say something parenthetically about cryptography in relation to my writing. Of course in every poem of any quality there's a certain amount of puzzle interest and there's really a fairly close relationship between an interest in riddles and puzzles and cryptography, and an interest in poetry. If one goes back to Aristotle, what he stresses the... he stresses the importance of surprise and discovery in poetry in the riddle and in the poem, and I know that I was drawn to cryptography from the beginning because I was also drawn in the direction of poetry.