The obvious answer to this question lies in the one word Art. The inspiration of Art of all kinds consists in the invention of precisely such a wider symbolism as has been above adumbrated. I am not speaking, of course, of symbolism of a forced and mechanical kind--symbolism designed and elaborated as such--but rather of that pre-existent but hidden concordance between visible and invisible things, between matter and thought, between thought and emotion, which the plastic arts, and music, and poetry, do each in their own special field discover and manifest for human wisdom and joy. In using these words, I must repeat, I am far from adopting the formulæ of any special school. The symbolism of which I speak implies nothing of mysticism. Nor indeed, in my view, can there be any real gulf or deep division between so-called realistic and idealistic schools. All that exists is continuous; nor can Art symbolise any one aspect of the universe without also implicitly symbolising aspects which lie beyond. And thus in the Arts we have symbolism at every stage of transparency and obscurity; from symbolisms which merely summarise speech to symbolisms which transcend it. Sometimes, as with Music, it is worse than useless to press for too close an interpretation. Music marches, and will march for ever, through an ideal and unimaginable world. Her melody may be a mighty symbolism, but it is a symbolism to which man has lost the key. Poetry's material, on the other hand, is the very language which she would fain transcend. But her utterance must be subliminal and symbolic, if it is to be poetry indeed; it must rise (as has been already hinted) from a realm profounder than deliberate speech; it must come charged, as Tennyson has it, with that "charm in words, a charm no words can give." Here, too, we must dwell for a moment upon another and higher kind of internal visualisation. I have spoken of the arithmetical prodigy as possessing a kind of internal blackboard, on which he inscribes with ease and permanence his imaginary memoranda. But blackboards are not the only surfaces on which inscriptions can be made. There are other men--prodigies of a different order--whose internal _tabula_ is not of blackened wood, but of canvas or of marble; whose inscriptions are not rows of Arabic numerals but living lines of colour, or curves of breathing stone. Even the most realistic art is something more than transcript and calculation; and for art's higher imaginative achievements there must needs be moments of inward idealisation when visible beauty seems but the token and symbol of beauty unrevealed; when Praxiteles must "draw from his own heart the archetype of the Eros that he made;" when Tintoret must feel with Heraclitus that "whatsoever we see waking is but deadness, and whatsoever sleeping, is but dream."