Besides communicating with parts of your self the column also opens up possibilities of communication with many non-physical and multi-dimensional beings throughout the Universe.
The MerKaBa is a spinning structure of light similar to the chakras. It is similar in that when spinning properly it works as an inter-dimensional gateway so that higher consciousness may incarnate into the physical body. The difference is that the MerKaBa is much larger, encompassing the entire body. In fact the MerKaBa is the structure of spinning light which allows for the incarnation of the light body itself. Without the MerKaBa being activated the other parts of the light body such as the chakras cannot incarnate properly and may not be stable.