Given this idea, I can't figure out how to deal with the fact that fonts are finite and, even with ligatures, relatively quickly enumerable. User interfaces, on the other hand, often require drawing arbitrary pictures. As I understand it, Chartwell takes advantage of the fact that charts have finite resolution, so that it's possible to enumerate all the possible heights for a bar or angles for a pie wedge as individual glyphs. But would that be possible for a general user interface? I may be missing something obvious.