Wuji - Taiji

Wuji - Taiji The Limitless (Wuji) produces the delimited, and this is the Absolute (Taiji) The Taiji produces two forms, named yin and yang The two forms produce four phenomena, named lesser yin, great yin (taiyin also means the Moon), lesser yang, great yang (taiyang also means the Sun). The four phenomena act on the eight trigrams (ba gua), eight eights are sixty-four hexagrams. http://en.wikipedia.org/wiki/Bagua_(concept)