 Inability to provide any positive answer to this question can motivate a different approach to conceptualizing becoming in Minkowski spacetime, an approach presented by the philosopher Howard Stein (1968, 1991). The basic idea of this approach is to begin from or to define concepts in terms of the geometric structure intrinsic to the spacetime rather than in terms of coordinates. In the present case, this approach leads one to try to define ‘becoming’ in terms of spacetime points and light cones. Pre-relativistically, ‘has become’ is defined relative to a plane of simultaneity. We have seen the limitations of the notion of a plane of simultaneity in special relativity in our discussion of the relativity of simultaneity. Stein begins, then, by proposing that one define the relation of ‘having become’ or ‘already definite’ with respect to spacetime points. A two-place relation schematically written as \(Rxy\) will be intended to capture the idea that point \(y\) has already become or is definite with respect to point \(x\).