There is a ‘still center’ for everything which is its peaceful center.
Even though it has no vibration it is not the emptiness nor it is of zero potential. The equilibrium which we aim at when we weigh a weight, is this still center. Every object has a center of gravity. Even in a dreadful storm, there is a ‘storm center’.
Always the energy radiates from such a center and that is why movement and action are produced. It is that center which may be called ShivaM and the energy that radiates from it and revolves about it is ambaal.