I'm not sure where I've seen this described, but apparently a single black hole already reflects light back toward the observer, through a series of concentric

I'm not sure where I've seen this described, but apparently a single black hole already reflects light back toward the observer, through a series of concentric rings, where each inner ring reflects light that has gone one more time around the black hole Edit: https://www.quantamagazine.org/black-holes-ring-of-light-could-encrypt-its-inner-secrets-20220908/ https://www.quantamagazine.org/black-holes-ring-of-light-cou... > Photons that make a single U-turn around a black hole and then zip toward Earth would appear to us as a single ring of light. Photons that make two U-turns around the hole appear as a fainter, thinner subring within the first ring. And photons that make three U-turns appear as a subring within that subring, and so on, creating nested rings, each fainter and thinner than the last. > Light from the inner subrings has made more orbits and was therefore captured before the light from outer subrings, resulting in a series of time-delayed snapshots of the surrounding universe. “Together, the set of subrings are akin to the frames of a movie, capturing the history of the visible universe as seen from the black hole,”