The relativistic theory is a theory of moving clocks. It is a theory on how things in the universe have frames of reference, and how those frames of reference are in relation to other frames of reference. The special theory of relativity is primarily about moving observers.

The General Theory of relativity draws relativistic relationships on matter, energy, acceleration and curvature. The general theory draws its speculations on reality as a direct consequence of the special theory. The General theory however, see's moving clocks quite differently. Eventually you will run into equations which show that moving clocks dissappear. This means that matter fields vanish, and all you are left with is an immutable energy field which does not change in time.