Negative space, in art, is the space around and between the subject of an image. Negative space may be most evident when the space around a subject, and not the subject itself, forms an interesting or artistically relevant shape, and such space is occasionally used to artistic effect as the “real” subject of an image. The use of negative space is a key element of artistic composition. The Japanese word “ma” is sometimes used for this concept, for example in garden design.
In a two-tone, black-and-white image, a subject is normally depicted in black and the space around it is left blank (white), thereby forming a silhouette of the subject. However, reversing the tones so that the space around the subject is printed black and the subject itself is left blank causes the negative space to be apparent as it forms shapes around the subject, called figure-ground reversal.
In the book project, I used the negative space surrounding the flowers in the picture to emphasize the cool palette of the scene minus the warm tones of the flowers.