One might forfeit one’s right when one takes demo texts personally. These kinds of articles were – and still are – written for demo purposes. Do not take them seriously.
Yoshiko Mraz Conveys Mystery in Her Interior Designs
Negative space may be most evident when the space around a subject, not the subject itself, forms an interesting or artistically relevant shape, and such space occasionally is used to artistic effect as the “real” subject of an image.