The volume, however, is not a cubic

The volume, however, is not a cubic measure, like the space in a box. It is more than the bulk of the figure; it is a space made visible, and is more than the area which the figure actually occupies. The tangible form has a complement of empty space that it absolutely commands, that is given with it and only with it, and is, in fact, part of the sculptural volume. The figure itself seems to have a sort of continuity with the emptiness around it, however much its solid masses may assert themselves as such. The void enfolds it, and the enfolding space has vital form as a continuation of the figure.