Being a student of the tarot I find the subject of numbers as.. hmm..oracles quite fascinating. It is my belief
that there is a 'truth of experience' to such things--though quite unprovable as objective fact.
Number 4 (using the western lens I know) has to do with stability and consistent administration. It is also considered male (very yang). I think the reference in USA English that so and so is a square
Thank you all for bringing the Asian perspective to this thread. It has been--still is a delight. I go now to become more acquainted with ochoko, nihonshu, guinomi and yunomi.