With thanks to Psan who posted it at the AP a while ago- a goodie indeed.
"From a quantum viewpoint, the etheric state appears to involve partial delocalization of the wave function, as will be discussed below. And it takes delocalization of your own consciousness to view it through second sight. While the physical realm and our normal waking consciousness are both highly localized or collapsed into a single sharp focal point, the etheric plane is more diffuse, like the tranced consciousness needed to perceive it. That diffuseness is what allows the etheric body to shape quantum events, to bias probability, because it is a structure diffused across multiple possibilities instead of being localized to just one as our physical body is."

http://montalk.net/notes/astral-physics

It goes into the possible physical characteristics of the etheric and astral using the pythagorean theorem to describe them. Mind boggling and cool.