[en] Under the influence of intense laser electrons begin to behave relativistically. Matter nonlinearly reacts to laser, exhibiting the relativistic nonlinearity'. Because of this property significant novel phenomena manifest themselves. By judiciously utilizing laser and matter, one can realize applications that cannot be accessed by the conventional technology before this. Compact laser acceleration is an example of this relativistic technique. A proper control of the wavefield generated during laser acceleration allows us to focus a counterpropagating another laser into a tiny spot, giving rise to a new method of compressing laser into super-strong intensity in the neighborhood of vacuum breakdown. We survey unique physical research opportunities that this new technique we call relativistic engineering can bring out. (author)