What is it? To me the void is a realm of potential energy awaiting instruction from it's master, you and me, to become that which it's told. Something to be manipulated.
For one to reach and be in touch with this void you must put all thought aside (condundrum in itself) and allow your 'self' to touch and play in the darkness and solitude (or so it seems) of your deepest recesses of thought. You must trace your thoughts all the way back to the source, which is were you will meet the void.
Once you get to this spot you will have a feeling of complete ease and detachment. You will no longer worry about the things that brought you to seek this void in the first place. Quite funny.
While playing in the void of your mind (the world) you may tap directly into the infinite intelligence that has accumulated over the timespan of life. You attain this knowledge through sheer instinct and vision. It's a strange marriage of the two.
The void is the place a soul may go to to find direction or to find truth. To find love and to find hate. In the void you may find what you look for for your looking at your self.
Find the void and you find the glass ball that looks into worlds.
edit - this is deep!