From this point of view, learning is more important than knowing, and the creation of a work of art is more important than the appreciation of it when it is finished.

All are to be thought of, not merely in terms of the artist, the thinker, and the reformer, but in terms of those hints and implications upon the horizon of present experience that serve as incitements to advance.

Horizon facts are those whose connection with the fully experienced is clear enough, but not their connection with what may yet be exeperienced (and is not yet). They are such aspects of the real world which attract the the attention of an imaginative scientist, and, as it will be argued later, of all artists. They are of all kinds: The implication of a dream, the unsolved mathematical problem, the new light on a chair, and the attractiveness of some situation never felt before.

§ References