Music being purely in time and architecture being purely in space, each is, in a manner and to a degree not possible with any of the other arts, convertible into the other, by reason of the correspondence subsisting between intervals of time and intervals of space.  A perception of this may have inspired the famous saying that architecture is frozen music, a poetical statement of a philosophical truth, since that which in music is expressed by means of harmonious intervals of time and pitch, successively, after the manner of time, may be translated into corresponding intervals of architectural void and solid, height and width.

In another sense music and architecture are allied.  They alone of all the arts are purely creative, since in them is presented, not a likeness of some known idea, but a thing-in-itself brought to a distinct and complete expression of its nature.  Neither a musical composition nor a work of architecture depends for its effectiveness upon resemblances to natural sounds in the one case, or to natural forms in the other.  Of none of the other arts is this to such a degree true:  they are not so much creative as re-creative, for in them all the artist takes his subject ready made from nature and presents it anew according to the dictates of his genius.

The characteristic differences between music and architecture are the same as those which subsist between time and space.  Now time and space are such abstract ideas that they can be dealt with best through their corresponding correlatives in the natural world, for it is a fundamental theosophic tenet that nature everywhere abounds in such correspondences; that nature, in its myriad forms, is indeed the concrete presentment of abstract unities.  The energy which everywhere animates form is a type of time within space; the mind working in and through the body is another expression of the same thing.  Correspondingly, music is dynamic, subjective, mental, of one dimension; while architecture is static, objective, physical, of three dimensions; sustaining the same relation to music and the other arts as does the human body to the various organs which compose, and consciousnesses which animate it (it being the reservatory of these organs and the vehicle of these consciousnesses); and a work of architecture in like manner may and sometimes does include all of the other arts within itself.  Sculpture accentuates and enriches, painting adorns, works of literature are stored within it, poetry and the drama awake its echoes, while music thrills to its uttermost recesses, like the very spirit of life tingling through the body’s fibres.