"'Yes, but what in Heaven's name is a sense of direction? The phrase explains nothing. However incoherent the mind of the animal or the savage may be, it is there somewhere, working on some data. I've been all through the psychological and anthropological side of the business, and after you eliminate the clues from sight and hearing and smell and half-conscious memory there remains a solid lump of the inexplicable.' "Hollond's eye had kindled, and he sat doubled up in his chair, dominating me with a finger. "'Here, then is a power which man is civilising himself out of. Call it anything you like, but you must admit that it is a power. Don't you see that it is a perception of another kind of reality that we are leaving behind us?... Well, you know the way nature works. The wheel comes full circle, and what we think we have lost we regain in a higher form. So for a long time I have been wondering whether the civilised mind could not recreate for itself this lost gift, the gift of seeing the quality of Space. I mean that I wondered whether the scientific modern brain could not get to the stage of realising that Space is not an empty homogeneous medium, but full of intricate differences, intelligible and real, though not with our common reality.' "I found all this very puzzling and he had to repeat it several times before I got a glimpse of what he was talking about. "'I've wondered for a long time he went on 'but now quite suddenly, I have begun to know.' He stopped and asked me abruptly if I knew much about mathematics. "'It's a pity,' he said,'but the main point is not technical, though I wish you could appreciate the beauty of some of my proofs. Then he began to tell me about his last six months' work. I should have mentioned that he was a brilliant physicist besides other things. All Hollond's tastes were on the borderlands of sciences, where mathematics fades into metaphysics and physics merges in the abstrusest kind of mathematics. Well, it seems he had been working for years at the ultimate problem of matter, and especially of that rarefied matter we call aether or space. I forget what his view was--atoms or molecules or electric waves. If he ever told me I have forgotten, but I'm not certain that I ever knew. However, the point was that these ultimate constituents were dynamic and mobile, not a mere passive medium but a medium in constant movement and change. He claimed to have discovered--by ordinary inductive experiment--that the constituents of aether possessed certain functions, and moved in certain figures obedient to certain mathematical laws. Space, I gathered, was perpetually 'forming fours' in some fancy way.