Yin and yang and yang are bound together as parts of a mutual whole (for example, there cannot be the bottom of the foot without the top). A way to illustrate this idea is to postulate the notion of a race with only men or only women; this race would disappear in a single generation. Yet, men and women together create new generations that allow the race they mutually create (and mutually come from) to survive. The interaction of the two gives birth to things, like manhood. Yin and yang transform each other: like an undertow in the ocean, every advance is complemented
Yin Yang Style Li (离), Kun (坤), and Dui (兑) which correspond to and form the changing ways of the Yin and Yang and the Bagua. The postures of crane walking and eagle spanning also correspond to the eight directions: East, West, South, North, Northeast, Northwest, Southeast and Southwest of the Yin and Yang and the Eight Trigrams. The movements also mimic the arc in the Yin Yang Fish. There are eight characters, eight directions, eight body sections, eight steps, eight posture palms, eight energies and eight coincidences. The Python Form Palms of Tian's family Yin Yang Bagua Zhang consists of eight postures: