I can only give my experience of the "Emptiness"

It is developed from "feeling" the space around you. You work at feeling the empty space. As you develope this feeling of the emptiness you realize that it's not empty at all but is filled with energy.

There are deeper and deeper levels of going into the emptiness, then for some reason you become aware that you are One with the Universe. It is experiential not analytical.
You'll know it when you feel it. It is a wonderful place to be.

hope that helps.

Jeff