[xelxebar]

Funnily enough, I have a copy of 無門関 sitting right in front of me. Pretty sure it's case 15.

I'd add that a lot of the stories are challenges in the sense of asking "What kind of mind must the characters have to give these kinds of answers?" There's usually a sense in which the interaction feels most natural.

In a way they are like inside jokes. Once you get it, there's little question about the meaning, and usually there's no need for any philosophical sophistication. In my experience, a good bit of The Gateless Gate is uncouth humor.