To Stigweard and TheWhiteRabbit:
Thank you! That was interesting. Stig, your square gives me more questions than it gives answers. Why square? Why only 9 squares? Why that order of numbers? Needless to say nothing there seems intuitive to me and it makes no sense. Why is hun on the left sude, west, and po on the right side, east? Why can't hun be north or a corner? I just don't get it.
It's obvious to me that the square is arbitrary, and that's fine. But! If you make a system like that, it better have some interesting and elegant properties. However if the system is arbitrary, but is not intuitive, and has no interesting properties and no elegance, then I don't think it's a good system. It is subjective, but that's my take on it. The magical square appears clumsy to me.
Excellent questions Gold ... I will preface my answer by saying that this is all on the periphery of my understanding so I apologise in advance if my response is in any way inadequate.
The Lo Shu (River Book) Square 洛書 was said to have been discovered on the back of a magical river turtle by the Emperor Hsia Yu 夏禹 (c. 4000 BC). It appeared as a 3X3 gridwork of black (Yin) and white (Yang) dots:
Count the dots in each section and you get:
The reason it is called the Magic Square is because when you add up the numbers in each row, column and diagonal you always get 15.
This basic mathematical understanding was eventually formalised into the I Ching by King Wen (1766-1121 B.C.):
And of course the entire body of Taoist sciences, Feng Shui, TCM, Astrology, Military and Political Strategy, Martial Arts, Spiritual Alchemy etc., find their root here.