The second of those is interesting. Most of the lines are right-justified, and just a few aren't. It looks to me as if it's right-justified the lines except for when it can't do so without introducing an unbearable amount of whitespace, in which case it's fallen back to ragged-right.

(You can see it isn't just ragged-right where most of the lines happen to end in the same place; compare the spacing on, e.g., the first two lines.)

I don't think I've ever seen anything typeset that way before.

The justification in On Intelligence is what I'm talking about wrt words being "separated at most 1 em." Contrary to what Gruber says, there are no "unsightly gaps between words" because there is a maximum distance of 1 em between words, after which it favours ragged right.