Say a photon was emitted from very far away such that it would take billions of years to reach us. According to Feynman's infinite paths, the photon travels every possible path on its way to reach us. The superposition of infinite trajectories collapses when it hits something solid, say an observer on earth for example. Then the trajectory of the photon is determined upon observation which determines it's past( relative to us) as well, essentially writing billions of years of history for that photon, which is rather astounding. This is just for one photon, but it could work for many as well, in principle. Does this translate over to observations of the CMBR? That is, the observations of the photons by us are localizing them to a definite spacetime position in the past? This is very different than saying that we, via CMBR, are observing the past.