It's a dynamic process...non linear and not intuitive....a Saddle Point
In mathematics, a saddle point or minimax point is a point on the surface of the graph of a function where the slopes of orthogonal function components defining the surface become zero but are not a local extremum on both axes. An example of a saddle point shown on the right is when there is a critical point with a relative minimum along one axial direction and at a relative maximum along the crossing axis. However, a saddle point need not be in this form. For example, the function f = x^2 + y^3 has a critical point at that is a saddle point since it is neither a relative maximum nor relative minimum, but it does not have a relative maximum or relative minimum in the y-direction.
