here's a visual poem, which I think was quoted at http://blogdogutemberg.blogspot.com/2007_03_01_archive.html on 12 Março 2007.
haven't worked out who it is by, or when it was made. will probably have to write a letter to the gentleman who posted it.
postscript: Gutemberg Cruz sent me an informative email. apparently, this one's by Almandrade, & probably from the 1970s. obrigado, Gute.