It had one eye only, but of two facets, or perhaps I should say that its eyes were contained beneath one eyelid. The eye, or facet, with which it looked, would sparkle and light up with intelligence, while the other remained dull and vacant. When it saw me first, it had, I thought, an instant of terror, turning into a vast perplexity. For some seconds the head remained twisted in my direction. I had learned something in the lesson of confidence, and I looked back as steadily, but with a thought that if it wished to come my way it should have all the space available to pass me in comfort. Whether it understood my thought I could not tell, but at length it turned its head away, and from that moment showed no consciousness of my existence. No doubt its own troubles were sufficient. It had its head lifted now, and was calling loudly, with a whistling scream, to which a call replied from the cliff-top, and looking up I saw that the edge was lined by the great birds, now perched upon it, with long necks craning over. I began to recognise its dilemma. For some reason it was evident that the air above the plain had no power to sustain its flight. Why, I could not imagine, but the fact was clear. On the other side was the cliff-wall, and between was the width of the opal path, on which there would be less than space to have spread its wings if it tried to rise and fly along it, even if it could rise from level ground, of which it might not be capable. The cliff here receded somewhat, as I have said, and I wondered whether it would attempt to scramble up it with beak and claws, and such help as its wings could give. But the recession was not regular. There were perpendicular crags which might well have baffled it. Anyway, after much consultation with its friends above, of which one seemed to have the most to say, whether from leadership or affection, it decided to make its way backward the way I had come, where it may have considered that the width of the gorge, or the easier rocks from which those frog-faced brutes assailed me, would give it access to the space it needed. So it turned from me with a rapid shuffling walk, while its companions moved along the cliff-top beside it with continued screams of advice, or encouragement; and it was with no reluctance that I proceeded in the opposite direction. CHAPTER IX THE TUNNEL OF FEAR The nervousness of the great bird while (as it were) trespassing on the opal pavement, confirmed my impression of the prestige enjoyed by the subterranean dwellers, among the creatures of the outer surface of the world into which I had entered. Its initial terror of myself, until it had recognised me as something distinct and inferior, was sufficiently significant.