2 pages from Alvaro's 12 X 9, published in 1967.he was a co-founder of the Brazilian process/poem movement (= poema/processo, in Portuguese), whose members wrote many visual poems about visual communication.
these pages purloined from one of Amir Brito Câdor's web places: seminariolivrodeartista.wordpress.com/2010/10/24/alvaro-de-sa-poemics
it appears that he's posted every page of 12 x 9. a wonderful book, deserving a new edition.