"Inside what? All before him was total darkness; not a glimmer of light was reflected back from his beam. He had expected this, but he had not really believed it. All the calculations had shown that the far wall was tens of kilometers away; now his eyes told him that this was indeed the truth. As he slowly drifted slowly into that darkness, he felt a sudden need for the reassurance of his safety line, stronger than any he had experienced before, even on his first EVA. And that was ridiculous. He had looked out across the light-years and the megaparsecs without vertigo; why should he be disturbed by a few cubic kilometers of emptiness?"
-from Rendezvous with Rama, by Arthur C. Clarke
