All verbs are nouns.
One thing, although outside the legitimate domain of current physical studies, that actually moves in spacetime is obviously there. Of course, one could argue that such a subjective experience is not the subject of physics. But then one must convincingly explain, why certain other subjective experiences are relevant to physics after all. So one has to explain, why many other our perception, for instance perceptions of what our measurement instruments has registered, are not illusions, and are very important for physics.