It is possible to build a virtual-reality generator whose repertoire includes every possible environment.

I suppose I'm trying to build an architecture that's as timeless as possible, although we're all creatures of our age.

You know I've got a generator that's still popping.

I myself believe that there will one day be time travel because when we find that something isn't forbidden by the over-arching laws of physics we usually eventually find a technological way of doing it.

Time travel may be achieved one day, or it may not. But if it is, it should not require any fundamental change in world-view, at least for those who broadly share the world view I am presenting in this book.

The truly privileged theories are not the ones referring to any particular scale of size or complexity, nor the ones situated at any particular level of the predictive hierarchy, but the ones that contain the deepest explanations.