Actually it seemed to him wholly unsatisfactory, and yet very lovely, the only really beautiful picture in the world. - Tolkien
He had a number of pictures on hand; most of them were too large and ambitious for his skill. He was the sort of painter who can paint leaves better than trees. He used to spend a long time on a single leaf, trying to catch its shape, and its sheen, and the glistening of dewdrops on its edges. Yet he wanted to paint a whole tree, with all of its leaves in the same style, and all of them different. There was one picture in particular which bothered him. It had begun with a leaf caught in the wind, and it became a tree; and the tree grew, sending out innumerable branches, and thrusting out the most fantastic roots. Strange birds came and settled on the twigs and had to be a#ended to. Then all round the Tree, and behind it, through the gaps in the leaves and boughs, a country began to open out; and there were glimpses of a forest marching over the land, and of mountains tipped with snow. Niggle lost interest in his other pictures; or else he took them and tacked them on to the edges of his great picture. Soon the canvas became so large that he had to get a ladder; and he ran up and down it, putting in a touch here, and rubbing out a patch there. When people came to call, he seemed polite enough, though he fiddled a little with the pencils on his desk. He listened to what they said, but underneath he was thinking all the time about his big canvas, in the tall shed that had been built for it out in his garden (on a plot where once he had grown potatoes).
One day, Niggle stood a little way off from his picture and considered it with unusual attention and detachment. He could not make up his mind what he thought about it, and wished he had some friend who would tell him what to think. Actually it seemed to him wholly unsatisfactory, and yet very lovely, the only really beautiful picture in the world.
After a time Niggle turned towards the Forest. Not because he was tired of the Tree, but he seemed to have got it all clear in his mind now, and was aware of it, and of its growth, even when he was not looking at it. As he walked away, he discovered an odd thing: the Forest, of course, was a distant Forest, yet he could approach it, even enter it, without its losing that particular charm. He had never before been able to walk into the distance without turning it into mere surroundings. It really added a considerable attraction to walking in the country, because, as you walked, new distances opened out; so that you now had double, treble, and quadruple distances, doubly, trebly, and quadruply enchanting. You could go on and on, and have a whole country in a garden, or in a picture (if you preferred to call it that). You could go on and on, but not perhaps for ever.
Leaf by Niggle by Tolkien link here
Thank you to Mark Kissler for this and many things