The Shrine of Light was a remarkable architectural work.
The enormous chamber that was located in the very center of the Astral Octagon obtained its light from all sorts of external sources, most notably the trinary stars that supplied the Yernstall Central Star Node with a lot of light and energy.
The Dyson swarms that intercepted a significant fraction of the outgoing electromagnetic radiation still let out enough illumination to light up much of the Astral Octagon's interior.
It took precise calculations and a lot of artistic imagination to shape light into art.
This was especially the case when the Shrine of Light had to look good at every hour of the day!
Throw in the orbital mechanics of the Astral Octagon, La Reine and the motion of other large light-reflecting objects, the calculations quickly turned dizzyingly complex!