Here's something about the tiles found in the Laurentian library in Florence.
Ben Nicholson did a seminar on this when I was in arch-school in chicago, it
was very interesting. Not sure if this is the stuff you want, but it's good stuff, enjoy Karl. PS - thanks for the tokyo discs!
http://bennicholson.com/ma/maestx.htm
http://www.leonet.it/culture/nexus/98/nicholson.html
http://www.nexusjournal.com/conferen...Nicholson.html