I like Evs Discription of the different levels - shades. I think it fits well.
There has to be a limit. your mind is a lot different than space. It has boundaries. Even if we have not found several of them there must still be limits.
ShadowNightwing has a point about the three basic levels to be catergorized in but they can be described at such differant levels and so many ways that I don't think three does it justice.
Like Democrat - Republican - Independent. There are so many variations of the three.