In “Extremis,” it seems as if the alien projectors are intended to
holographically simulate possibly all of planet Earth.
However, there are only “portals” to a handful of places in the projector room, among which are the Vatican, the White House, the Pentagon, CERN, and so forth.
So if the projectors project the whole Earth, why do they only seem to be projecting certain locations?
This would tend to suggest that the aliens are only simulating important places, which would make sense: they want to model the places that would pose a threat to them when they really attack. While the nature of Earth society as a highly interacting system means that this would be impossible in reality (how can you simulate people walking into the White House if you don’t know where they should be walking from?) we can probably attribute this to alien technology.
But if the projectors only project certain places, how do we explain Bill, Nardole, and the Doctor being part of the simulation?
How much of the Earth do the projectors simulate?