Free Little, Big by John Crowley

there are fairy warriors on great steeds, banshees and pookahs and ogres who are huge, larger by far than men.
    "What is the explanation for this?
    "The explanation is that the world inhabited by these beings is not the world we inhabit. It is another world entirely, and it is enclosed within this one; it is in a sense a universal retreating mirror image of this one, with a peculiar geography I can only describe as 
infundibular
." He paused for effect. "I mean by this that the other world is composed of a series of concentric rings, which as one penetrates deeper into the other world, grow larger. The further in you go, the bigger it gets. Each perimeter of this series of concentricities encloses a larger world within, until, at the center point, it is infinite. Or at least very very large." He drank water again. As always when he began to explain it all, it began to leak away from him; the perfect clarity of it, the just-seizable perfect paradox of it, which sometimes rang like a hell within him, was so difficult— maybe, oh Lord, impossible—to express. The unmoved faces before him waited. "We men, you see, inhabit what is in fact the vastest outermost circle of the converse infundibulum which is the other world. Paracelsus is right: our every movement is accompanied by these beings, but we fail to perceive them not because they are intangible but because, out here, they are too small to be seen!
    "Around the inner perimeter of this circle which is our daily world are many, many ways—call them doors—by which we can enter the next smaller, that is larger, circle of their world. Here the inhabitants appear the size of ghost-birds or errant candle-flames. This is our most common experience of them, because it is only through this first perimeter that most people ever pass, if at all. The next-innermost perimeter is smaller, and thus has fewer doors; it is therefore less likely anyone would step through by chance. There, the inhabitants will appear fairy-children or Little People, a manifestation correspondingly less often observed. And so on further within: the vast, inner circles where they grow to full size are so tiny that we step completely 
over
 them, constantly, in our daily lives, without knowing we do so, and never enter there at all—though it may be that in the old heroic age, access there was easier, and so we have the many tales of deeds done there. And lastly, the vastest circle, the infinity, the center point—Faëry, ladies and gentlemen, where the heroes ride across endless landscapes and sail sea beyond sea and there is no end to possibility—why that circle is so tiny it has no door at all."
    He sat, spent. "Now." He put his dead pipe between his teeth. "Before I proceed to certain evidences, certain demonstrations, mathematical and topographical" —he patted a messy pile of papers and place-marked books beside him—"you should know that there are individuals to whom it is given to be able to penetrate at will, or nearly, the small worlds I have discussed. If you require 
firsthand
 evidence of the general propositions I have laid down, my daughter Miss Violet Bramble . . ."
    The company, murmuring (it was this they had come for), turned toward where Violet sat in the light of the red-shaded lamp.
    The girl was gone.

No End to  Possibility
    It was Drinkwater who found her, huddled on the landing of the stairs that led up from the Society's rooms to a lawyer's office on the next floor. She didn't stir as he climbed toward her, only her eyes moved, searching him. When he moved to light the gas above her, she touched his shin: "Don't."
    "Are you ill?"
    "No."
    "Afraid?"
    She didn't answer. He sat down beside her and took her hand. "Now, my child," he said paternally, hut felt a thrill as though some current ran through her hand to his. "They don't want to hurt you, you know, they won't badger you. . . ."
    "I am not," she said slowly, "a circus show."
    "No." How old could she be, to have to live