ABSTRACT
The volitional fact of externalization is preceded by a complex of various kinds of knowledge. These are known as technique, like all knowledge which precedes a practical activity. The collection of technical knowledge at the service of artists desirous of externalizing their expressions, can be divided into groups, which may be entitled theories of the arts. Thus arises a theory of Architecture, a theory of Sculpture, a theory of Oratory, and a theory of Music. Such collections of precepts abound in all literatures. And since it is impossible to say what is useful and what useless to know, books of this sort become very often a sort of encyclopaedias or catalogues of desiderata. One can obtain the effect of certain plays by simply reading them; others need declamation and scenic display: there are some artistic intuitions which need for their full externalization words, song, musical instruments, colours, statuary, architecture, actors.
