LOOK AT the LUNAR MONTH! URL of this document: http://helios.unive.it/~dsao/pregadio/pictures/firephases.html CITING:<<...From the outer to inner rings, each ring of the diagram drawn by Yu Yan shows: The twentyeight lunar mansions (xiu) Sixty of the sixtyfour hexagrams The thirty days of the lunar month The twentyfour periods of the year The twelve "sovereign hexagrams" (pigua) The twelwe Branches of the Earth (dizhi) Six of the eight trigrams The four seasons The four emblematic animals (White Tiger, Red Bird, Green Dragon, and Dark Warrior) In the innermost circle are the seven stars of the Great Bear. Its circular movement determines orientation (space) and sets in motion the various cycles of time. As noted above, this diagram shows only six of the Eight Trigrams and only sixty of the Sixtyfour Hexagrams. The remaining two trigrams and four hexagrams are: qian, i.e., Pure Yang [a hexagram] kun, i.e., Pure Yin [a hexagram] kan, i.e., Yang within Yin [both a trigram and a hexagram] li, i.e., Yin within Yang [both a trigram and a hexagram] ...>> (THESE LAST FOUR SEEM TO BE RELEVANT TO THE ROTATING TENNIS BALL!-S.Shishkov)