The World Lines Of Spacetime Viewed Through Systemic Functional Linguistic

Penrose (2004: 394):

How do we incorporate Einstein’s notion of an ‘inertial’ motion into the structure of spacetime? As a step in the direction of the full Einstein theory, it will be helpful to consider a reformulation of Newton’s gravitational theory according to Einstein’s perspective. … Roughly speaking, in Cartan’s scheme, it is the inertial motions in this Einsteinian, rather than the Newtonian sense, that provide the ‘straight’ world lines of spacetime.

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From the perspective of Systemic Functional Linguistic Theory, the notion that spacetime is structured by world lines confuses circumstance (spacetime) with process (world line). From this perspective, world lines are trajectories in spacetime, not structures of spacetime.