The twin troublesome concepts of the ‘I’ and the ‘now’ are deeply interlinked.  Both commit the same error of the infinitesimal.  They cannot be infinitesimal concepts.  As we understand one better, so too the other will change in meaning.  Physics and dynamics just shows us how deeply weird the ‘now’ is.  The weirdness of the ‘I’ is becoming apparent too.  Entertain guests at dinner parties by alternating between talking about the space-time continuum and the I-Now-Infinitesimal.