Polarity is expressed in feng shui as Yin and Yang Theory. Polarity expressed through yin and yang is similar to a bipolar magnetic field. That is, it is of two parts: one creating an exertion and one receiving the exertion. Yang acting and yin receiving could be considered an early understanding of chirality. The development of Yin Yang Theory and its corollary, Five Phase Theory (Five Element Theory), have also been linked with astronomical observations of sunspots.

The "elements" of feng shui (water, wood, fire, earth/soil, metal) are made of yin and yang in precise amounts (Greater wood has less yin than lesser wood, but not as much yin as water, and so forth). Earth is a buffer, or an equilibrium achieved when the polarities cancel each other. This explains why feng shui is said to be about balance.

Source: Feng shui - Wikipedia, the free encyclopedia