The upper and lower arcs show the flow of action producing subjective sensations mapped into the interior of matter. The arrows superimposed on the pages represent the interaction of gravito-electric force fields that connect the external send and receive aspects of matter. The language of mathematics is used to define precise abbreviations for those concepts to avoid impossibly long repetitions of English text, which would be required to explain the behavior of complex systems encountered in everyday life. Reversibility is a property of isolated systems in which action stays within the medium involved. An example of reversible change is provided by the water wave example. The transfer of action to a neighboring column retains the amount of action flowing in the degrees of freedom defining the entire medium. If the shape of that medium repeats, such as standing waves of water contained in a bucket, the amount of action flowing per repetition event will remain constant.