In my last post I talked about how we humans decide what is moral because we ourselves are God. I was being a little more literal about us being God than you may have thought. My idea is based on Carl Jung's theory of the collective unconscious.
The idea is that beneath our own individual consciousness there lies a unified consciousness/will that actively constructs what we call reality. This collective is like a network of our minds connected by the power of will. What we call physics is a collectively agreed upon set of rules to make sense of things and to interact with one another in an orderly fashion. Gravity exists because we agree that we don't want to just float out into space and so on.
To help understand this, think about our dreams. When you dream, you are temporarily cut off from the network and your mind attempts to construct a reality on its own. By itself, your mind is not powerful enough to construct a sensible reality. This is why our dreams lack that "solidity" of the collective reality. All of our brainpower working together is much more powerful, and because of the balance of concurrence and rejection of ideas, we can settle on a reality that makes sense and feels real.
I found a video on youtube that sums this idea up fairly well, though it's kind of hard to follow at times. http://www.youtube.com/watch?feature=player_embedded&v=qAjC81MUe_I