Śūnyata (शून्यत, “void”).— If you can concentrate on your body as void (śūnyata) or space and transcend all thoughts, even for a moment, your mind will be liberated and will take on the form of that void. It is important to note that you do not have to concentrate for hours and hours in order to experience this state. Even if you focus the mind for just a moment, it is enough to give you the experience of a heightened state of awareness.

( Vijñānabhairava verse 46)