There are many places online where I can find koans. But I don't think a koan by itself is a topic I'm looking for on LessWrong.com, unless a poster is using it to make a particular point about rationality, a point which they explain as part of the content of the post. Plopping down a koan in front of us and expecting us all to figure out your point, or waste multiple people's time Googling when you could have simply linked to an interpretation, just isn't an optimally efficient transfer of rationality. It's not that it's bad, it's just not up to the standard of articles you've written or the general standards of LessWrong.com.