A matrix intersects any moment in a rect.

Thus the matrix of r intersects the moment M in a rect {rho}.

Thus {rho} is the instantaneous rect in M which occupies at the moment M the straight line r in the space of {alpha}.

Accordingly when one sees instantaneously a moving being and its path ahead of it, what one really sees is the being at some event-particle A lying in the rect {rho} which is the apparent path on the assumption of uniform motion.

But the actual rect {rho} which is a locus of event-particles is never traversed by the being.