Rather interesting discussion in the book at the moment about whether nothingness is real or whether it is just a by-product of our way of thinking. I.e. we go somewhere and there is a quilt hanging on a wall, but next time we go it is gone, we need a word or a concept to describe the lack of the quilt.
For some reason it made me think back to that idea from theological thinking about evil. I think it was Augustine who said there was no such thing as evil it was merely an absence of goodness. In this case both evil and nothingness are concepts we have thought up to describe something we have noticed.
Discussion is ongoing but it seems that Sartre thinks that nothingness is real. I’d be quite happy with it just being a concept, but I shall persevere and see what else he has to say on the topic.