What do you think "density" means?

[anagogy]

I personally think that the physical vehicle associated with each density directly limits the experiential consciousness possible.  So basically the mind complex puts a brake on 'pure consciousness' and runs it through the 7 rays associated with that particular density.  Ra mentioned (in one of the most delightful answers) that the rays in each density have such a different meaning, that it's hard for us to conceive.  And so the amount and quality of work is vastly different, even though the schema of the 7 energy centres holds throughout the densities.

That's a good point about the rays taking on different meanings in other densities.

From my perspective, since we are 3rd density and thus primarily yellow ray identified, we see all the other rays of the octave through that identification, so for us red ray is something like: the "survival of self awareness" and orange ray is the "personal growth of self awareness" and so on.  In the next density, when we are green ray identified, we would see the rays through THAT lens, so it would be something like the "survival of empathy" for red ray and the "personal growth of empathy for orange" and so on up the rays.  

The more primal lens or ray in front completely alters the conscious interpretation of the lens in back, creating a different type of perceptual experience. It is interesting to think about how the meanings will change.