It is most certainly not a koan. It is not a thing to put you in a state were you can understand a thing. It is a teaching. It actually tells you what to think

It is most certainly not a koan. It is not a thing to put you in a state were you can understand a thing. It is a teaching. It actually tells you what to think, and how to get there. He talks about negligence, not attending. And then he lists a bunch of games, the last of which is "imitating deformities". That example alone should get you thinking about misusing your purpose, about using the mind to escape and not be present. Inventing dragons to fight. All that. I mean, it's all there, if you think about it for five minutes.