Physics has had a new theory: the theory of Observational Relativity (OR). The theory of OR has discovered that all theories or spacetime models in human being’s physics must be branded with observation. The theory of OR has uncovered the root and essence of the relativistic effects of matter motion and matter interactions presented in spacetime: all relativistic effects are observational effects and apparent phenomena -- the speed of light is not really invariant; spacetime is not really curved. Newton’s classical mechanics is a theory of idealized observation with the idealized observation agent OA, presenting us with the true reflection of the objective physical world; Einstein’s relativity theory is a theory of optical observation with the optical observation agent OA(c), presenting us with only an optical image of the objective physics world, not exactly the physical reality. The theory of OR is a theory of the general observation agent OA() (0<<; ), which has genralized and unified Newton’s classical mechanics and Einstein’s relativity theory: as , the theory of OR strictly reduces to Newton’s classical mechanics; as c, the theory of OR strictly reduces to Einstein’s relativity theory. In the theory of OR, Newton’s classical mechanics and Einstein’s relativity theory are just two special cases, i.e., what Hawking called ‘partial theories’. Now, the theory of OR has become what Hawking called a ‘complete theory’. The theory of OR would inject fresh blood and new ideas into physics. Mankind must re-examine his physics and reshape his view of nature.