The Tao Te Ching says, Tao gives birth to one, which gives birth to two, two gives birth to three, and three gives rise to all things. All things bear yin and embrace yang, and the energy is in harmony.
Tao itself contains two qi of yin and yang. The two qi of yin and yang intersect to form a suitable state, which is called invigorating qi. All things are produced in this state, which is the world we live in - the polarity. However, besides the polarity, there are cathode and anode, which are parallel time and space that exist at the same time as the polarity.
Everyone has a corresponding original body in the other two extreme realms. In the other two extreme worlds, people may have completely different fates from those in the polar world...