This may be an ever expanding mathematical riddle. You solve one, we get to move on to the next level.
The history of the 3x3 magic square goes way back. Chinese legends concerning the pre-historic Emperor Yu (夏禹) tell of the Lo Shu, often in connection with the Ho Tu (河圖) figure and 8 trigrams. In ancient China there was a huge deluge: the people offered sacrifices to the god of one of the flooding rivers, the Lo river (洛水), to try to calm his anger. A magical turtle emerged from the water with the curious and decidedly unnatural (for a turtle shell) Lo Shu pattern on its shell: circular dots giving unary (base 1) representations of the integers one through nine are arranged in a three-by-three grid. http://en.wikipedia.org/wiki/Lo_Shu
There is only one unique solution to the 3x3 magic square. Since we have 10 fingers (digita = Latin), wouldn't it be nice to find a home for the 0 digit? Tell me where you think is the best place for the 0 in relation to the other nine and why.