I'm flattered that people seem to have enjoyed this essay of mine. I'm a little embarrassed that this happened even though I hadn't gotten around to updating the text to refer to the examples that are in the actual diagrams. On the other hand, nobody seems to have noticed.

I had promised to take a one-year break from commenting on HN because it had turned into a place where people were comparing one another to garbage https://news.ycombinator.com/item?id=12598071 but I am breaking that promise now to answer these comments.