One of the advantages of a thorough assimilation of what may be called the theosophic idea is that it can be applied with advantage to every department of knowledge and of human activity: like the key to a cryptogram it renders clear and simple that which before seemed intricate and obscure. Let us apply this key to the subject of art, and to the art of architecture in particular, and see if by so doing we may not learn more of art than we knew before, and more of theosophy too. The theosophic idea is that everything is an expression of the Self-or whatever other name one may choose to give to that immanent unknown reality which forever hides behind all phenomenal life-but because, immersed as we are in materiality, our chief avenue of knowledge is sense perception, a more exact expression of the theosophic idea would be: Everything is the expression of the Self in terms of sense. Art, accordingly, is the expression of the Self in terms of sense. Now though the Self is one, sense is not one, but manifold: and therefore there are arts, each addressed to some particular faculty or group of faculties, and each expressing some particular quality or group of qualities of the Self. The white light of Truth is thus broken up into a rainbow-tinted spectrum of Beauty, in which the various arts are colors, each distinct, yet merging one into another-poetry into music; painting into decoration; decoration becoming sculpture; sculpture-architecture, and so on.