http://imgs.xkcd.com/comics/tabletop_roleplaying.pngI like this quote:
"In addition to ancestor-simulations, one may also consider the possibility of more selective simulations that include only a small group of humans or a single individual. The rest of humanity would then be zombies or “shadow-people” – humans simulated only at a level sufficient for the fully simulated people not to notice anything suspicious."
Can you say NPCs?