Source: p 193, Philosophy: A Complete Introduction (2012) by Prof. Sharon Kaye MA PhD (in Philosophy, U. Toronto)
Right now you are reading this book. Stop for a moment and think of yourself getting up and throwing the book out of the window...
Because this version of you doesn't exist, it is pure nothingness. Although you can't experience something that doesn't exist, you can experience the void it creates.
There are two possible versions of you: the one that goes on reading this book and the one that gets up and throws the book out of the window. Both are pure nothing, and therefore both are genuine possibilities for you.
Awareness of nothingness is a state of mind. You have to notice the things you are not in order to realize you are free. The problem is that most people most of the time avoid this realization because they are mired in bad faith.
Why is the bolded true? I understand that if I suspend reading after finishing the 2nd paragraph, then these two genuine possibilities have not been realised; but it still sounds strange to describe these two genuine possibilities as pure nothing?