Today I worked on building a ‘Matrioshka Brain’, which is where my narrator aliens live and run their massive simulations. A Matrioshka brain is a hypothetical megastructure proposed by Robert Bradbury, based on the Dyson sphere, of immense computational capacity. It is an example of a Class B stellar engine, employing the entire energy output of a star to drive computer systems. The idea is that a megastructure surrounds the star and harvests as much energy as is possible.
The star that the alien Matrioshka brain resides around is a green star. There are, in fact, no naturally occurring green stars, but the idea is that this is actually an artificial star the aliens built themselves. Both the brain and the star are meant to illustrate the incredibly advanced technological level of achievement the aliens have.
Here is a video test of the result: