F.W. Goudy has a nice bit in one of his books where it is shown how the lowercase _g_ developed from the uppercase --- I also have a photocopy of page from a calligraphy text where it advocates for using the older script forms for headings, more recent for subheads, and then setting body text in current/recent styles, using age as a guide to hierarchy, which I've done for a couple of projects and it can have a nice effect.
