According to Doctor Ilchi Lee book there are three large system networks in our bodies. We all know about the circulatory system and the nervous system. Blood and oxygen flow through the circulatory system. The nervous system carries information via chemical signals. If we were to compare the circulatory system to plumbing, then the nervous system would be a telephone network.

However, connecting two pipes together does not mean that water will flow through them. In order for the water to flow, you need power to drive the water in a certain direction. Likewise, just because two telephones are connected does not mean that they can communicate. In DahnHak you also need an electrical supply to power the lines and equipment. Then, what is the power that drives us… our blood, and the signals of our nervous system? It is Ki energy.

The meridian system is the name given to the system of pathways along which Ki energy travels throughout our body. This is the third network system in our body. However, meridians are not closed and specifically defined pathways as are the circulatory and nervous systems. Meridians consist of pathways along which energy flows in highest density. Energy does not travel through a fixed, predetermined highway system, but forms a network of roads by the act of passing.