I've actually never gotten to play real Zendo, but you can make up your own class of koans, like Lisp programs or regexes. Maybe the real-worldness of arrangeme

I've actually never gotten to play real Zendo, but you can make up your own class of koans, like Lisp programs or regexes. Maybe the real-worldness of arrangements of pyramids does give them more of a Zen feel?