In reply to Interesting[?]:
Thanks for the link. But I have to say that's not the same thing - it just shows the drafting of outlines (which obviously has been happening for centuries). The main idea in this thread (to me) is the free-form chirographic rendering of outlines; sort of how chirographers think of the black, but applied to the outline (which has no thickness). One thing to look for is "funny" crossings of outlines (and not the sort that happens when you're marking the black - like the "o" in Peter's example).
But more potential examples would be great. The thing is if you have a point to make I think you should make the effort to provide evidence. I don't go on a wild-goose chase when I can't even hear the goose.
hhp