what is the "density" exactly means?

[Nabil Naser]

I can share with you a simplified analogy of my perspective of densities.
Imagine an infinite space that is made of the same thing. It is made of round points of energy that are packed together.
Now think about one of these little ball of energy, and imagine that it is spinning or vibrating in place. Consider what will happen next to it. How many other balls will it affect? how will the vibration be transferred between the balls? What possible shapes are possible with that single point and others?
Let us call this the 1st density.
Now consider two balls of energy connected together, and vibrating and spinning together. We ask the same questions as before.

Now imagine 3 balls connected together and vibrating and spinning together. The first thing we notice about these 3 balls is that can have a common center between them, that is outside them. That is when the 3 connect like a little triangle. Consider again the possible vibrations against other balls, and the possible shapes that can be created.

We can call this 3rd density.

This is a simplification of how I view the different densities.
The actual Octave repeats after the 7th density, in Ra's teachings.

What is this means that human is the entity of third density or animal is the entity of second density? Is this means that the mind or the body is in the specific density? Does a fourth density entity have a body like us? Or they don't need one because they live in the time/space dimension.