In most cases, Chillida's works involve architectural, urban or landscape aspects, and the problem that the artist must face is the organization of the works in the space, whether in relation to the external environment in which the work is placed or to interior space, closed and sometimes hermetic, which for the artist has a value that is both stimulating and creative. This volume also includes a wide selection of the Basque artist's writings that bring us closer to his desire to"define the hollow three-dimensional through the full three-dimensional, establishing at the same time a kind of dialogue between them ... The dialogue between the forms, whatever they may be, are much more important than the forms themselves.”