I have sent this around as an email already, but I know some of you don't always get my emails, and posting it here will allow you to discuss it, should you want to. A couple of you were asking about poems (rather than manifestoes) that use typographical experimentation. This is one of my favourites, by the American poet, e. e. cummings:
I'd be very interested to know what you think. You can see a very useful selection of critical interpretations of the poem here, but make up your own minds before seeing what the critics say.
Cummings was another American poet who came to Europe and was involved in the First World War, and lived in Paris in the 1920s. He was also a painter and met Pablo Picasso, and was influenced in his poetry (like so many others) by Ezra Pound. He is a strange mix of the avant-garde and the traditionalist - some of his poetry is quite traditional, and his use of nature in his poems especially is in some ways close to that of the Romantics.