All of imagination - everything that we think, we feel, we sense - comes through the human brain. And once we create new patterns in this brain, once we shape the brain in a new way, it never returns to its original shape.

For most of human history, there was a ruling class and then there was everybody else. If you were part of everybody else, it wasn't your job to imagine a different future, different ways of doing things. So, imagination is a fairly modern phenomenon.

All of imagination - everything that we think, we feel, we sense - comes through the human brain. And once we create new patterns in this brain, once we shape the brain in a new way, it never returns to its original shape.