what is the "density" exactly means?

[zenmaster]

I think this is the right answer by adding that 4th density body could be seen in our space/time. I think it is also a 3 dimensional body and there's no 2 or 4 dimensional bodies. Ra use the term "density" just like us. A 3rd density body could have a 3 dimensional consciousness, while 2nd density body could only allow a 2 dimensional consciousness and the body of 4th density allow a 4 dimensional consciousness to live in.

In first density, the physical universe is a "body" principle. The arbitrary interpretation/definition of this body requires "mind". "Mind" is a principle that provides structure, organization, and growth, for example. In first density, mind = time, while space = body.

Each density has its own mind and body principles.

But i still don't understand the following materials:
Book III,session 63
"As the green-ray cycle or the density of love and understanding begins to take shape the yellow-ray plane or Earth which you now enjoy in your dance will cease to be inhabited for some period of your space/time as the space/time necessary for fourth-density entities to learn their ability to shield their density from that of third is learned.
Meanwhile there is another sphere, congruent to a great extent with yellow ray, forming. This fourth-density sphere coexists with first, second, and third. It is of a denser nature due to the rotational core atomic aspects of its material. We have discussed this subject with you. The fourth-density entities which incarnate at this space/time are fourth-density in the view of experience but are incarnating in less dense vehicles due to desire to experience and aid in the birth of fourth-density upon this plane."

It is the most confusing thing that the 4th density entities will learn to shield their density from the 3rd and the last word "plane" imply that the 3rd and 4th density may not in the same dimension? Could anyone interpret this?

This statement has never made any sense to me:

As the green-ray cycle or the density of love and understanding begins to take shape the yellow-ray plane or Earth which you now enjoy in your dance will cease to be inhabited for some period of your space/time as the space/time necessary for fourth-density entities to learn their ability to shield their density from that of third is learned.