What are they? Imagination is such a ubiquitous thing, so essential to the most ordinary business of life that we ought to know a great deal about it.

We know something about images, imagery, visual and auditory and motor types; but all this is reproductive imagination.

About creative, constructive imagination we hardly know anything of practical use.

There is reason to think that for the purpose of aesthetic study the Artist as a type he is a very clearly defined human and psychological type may be regarded as enjoying almost pure examples of aesthetic experience, certainly purer, more permanent, more thorough than fall to the lot of the average spectator or listener.

From him we ought to secure insights into aesthetic experience far more valuable than from other sources.