I suppose I have been selected to speak on art because I can speak on that subject without prejudice, knowing nothing about it. I have on this subject no hobbies, no pet theories, and consequently will give you not what I know, but what I think. I am an Agnostic in many things, and the way I understand art is this: In the first place we are all invisible to each other. There is something called soul; something that thinks and hopes and loves. It is never seen. It occupies a world that we call the brain, and is forever, so far as we know, invisible. Each soul lives in a world of its own, and it endeavors to communicate with another soul living in a world of its own, each invisible to the other, and it does this in a variety of ways. That is the noblest art which expresses the noblest thought, that gives to another the noblest emotions that this unseen soul has. In order to do this we have to seize upon the seen, the visible. In other words, nature is a vast dictionary that we use simply to convey from one invisible world to another what happens in our invisible world. The man that lives in the greatest world and succeeds in letting other worlds know what happens in his world, is the greatest artist.
I believe that all arts have the same father and the same mother, and no matter whether you express what happens in these unseen worlds in mere words--because nearly all pictures have been made with words--or whether you express it in marble, or form and color in what we call painting, it is to carry on that commerce between these invisible worlds, and he is the greatest artist who expresses the tenderest, noblest thoughts to the unseen worlds about him. So that all art consists in this commerce, every soul being an artist and every brain that is worth talking about being an art gallery, and there is no gallery in this world, not in the Vatican or the Louvre or any other place, comparable with the gallery in every great brain. The millions of pictures that are in every brain to-night; the landscapes, the faces, the groups, the millions of millions of millions of things that are now living here in every brain, all unseen, all invisible forever! Yet we communicate with each other by showing each other these pictures, these studies, and by inviting others into our galleries and showing them what we have, and the greatest artist is he who has the most pictures to show to other artists.