Science then is marked by a restlessness until it reaches this omniscience. It began when the first man said "Why?" The moment that question is asked, Science is launched upon its course. But the answer to that question merely prompts anyone of scientific instincts to say "Why?" to the answer. Why is there a war? Historical science will point to the diplomatic documents, and from them to the course of history moulding national aspiration. Then if we say, "Why was the cause of war such? And, why were there such national aspirations?" we shall find ourselves soon investigating the literature of the countries and then their climates; from this we are shortly involved in astronomy and geology and all the other sciences. You can have nothing that is final until you reach omniscience. And so Science moves, perpetually saying "Why?" to every statement that is made. Far in the distance, in the infinite distance, is its goal of a complete satisfaction gained through understanding the universe in its entirety. Art can similarly only achieve a provisional attainment of its goal; but the attainment while it lasts is more substantial. Its method, as distinct from that of science, is mental rest. The aim of the artist is to concentrate attention upon the object, holding it there by various devices. That is why pictures are put into frames. Something abruptly irrelevant, although not discordant, is put round the object to help us fix our minds upon it. That is why poetry is written in metre. The mind is abruptly brought back by the recurrence of the rhythm or the recurrence of the sound in rhyme, and held within the total composition. We notice that it is precisely where the subject matter of the poem is slight that the rhythm needs to be strongly marked or the system of rhyme complicated; where the subject matter itself has a strong appeal, any rhyming seems to be out of place and tiresome. The aim is simply to grip the attention and hold it upon the object and make us see it as it is; not after the fashion of science, connecting it with other things, but understanding it by getting to know it in and for itself as thoroughly as may be.[#] Now in thus concentrating attention upon some one object and claiming complete absorption in that object, art is implicitly claiming to give a perfect mental satisfaction and an absolute peace. But it can never succeed in that unless the object upon which it is concentrating our attention is an adequate symbol for the whole truth of things in which the whole of our nature will find such satisfaction. [#] This is why no great work of art over becomes out of date, whereas the work of a great scientist is always liable to do so, because his successors revise it in the light of ever widening knowledge.