It's interesting to reflect that Lewis's Perelandra and Tolkien's unfinished Notion Club Papers deal as much as they do with the concept of time. The Lewis novel, among other things, dwells on the theme of "innocence to experience" -- which, for us, involves loss ("Where is it now, the glory and the dream?" etc), but for the Lady of Venus, need not involve loss -- i.e. she gains experience without actually losing her innocence, in the sense that her mind, unclouded by our ignoble passions, learns very swiftly and well, and she learns from experience, but not at the cost of the good things of childhood, its capacity for wonder and delight, etc. The Tolkien work also deals with time and the idea (from J. W. Dunne's Experiment with Time) that dreams contain elements not only of what for us is past but what for us is future. These books are more learned than, I think, people often realize; they are fantasy adventures but also have elements, especially Lewis's, of high philosophical activity.
