The Friday night table always included a squeeze ketchup (or, if you prefer, catsup) bottle that carried a line art illustration of a waitress holding a tray on which there was a hamburger and a squeeze ketchup bottle. That bottle had the same illustration on it, as did the bottle it depicted, and so forth, as far as one could make out the details.
I was reminded of this a little while ago when I was browsing the list of bestselling books about blogging. (I have a vested interest in that list, of course.) Like the ketchup bottle illustration, the blogging books mirror a reality that mirrors a reality that mirrors ... and so on. It fascinates people; nearly a hundred books about blogging are selling in the thousands of copies. And some of the books are turning into blogs, while others started out as blogs. It's like squeezing the ketchup bottle and having another bottle come out!