For his education had had the curious effect of making things that he read and wrote more real to him than things he saw. Statistics about agricultural laborers were the substance; any real ditcher, ploughman, or farmer's boy, was the shadow. Though he had never noticed it himself, he had a great reluctance, in his work, ever to use such words as "man" or "woman." He preferred to write about "vocational groups," "elements," "classes," and "populations": for in his own way, he believed as firmly as any mystic in the superior reality of the things that are not seen.
--C. S. Lewis, That Hideous Strength