 Nick Bostrom has recently argued it is quite likely that we humans are actually virtual humans: computer simulations of flesh and blood creatures. Bostrom reasons that if our mental lives can be simulated then it is highly probable that our distant descendants (more intelligent or at least more technologically advanced ‘post-human’ successors) will eventually create such a simulation in which case it is more likely that we are the unwitting denizens of a simulated world than the flesh and blood inhabitants of the real world we take ourselves to be. At least this will be so unless the chances that creatures of our intelligence are doomed to become extinct before reaching the technological sophistication to create simulations are overwhelmingly large or else almost no such technologically capable civilizations have any interest in simulating minds like ours in the first place [Bostrom, N., 2003]. 