Then suddenly, he seemed to hear a girl's voice beside him: "Oh, what a darling little cat! What's its name?" "Smokeball," he said, without thinking. "She's about the color of a shrapnel-burst...." Then he stopped short, looking about. There was nobody in sight, and he realized that the voice had been inside his head rather than in his ear. "What the devil?" he asked himself. "Am I going nuts?" There was a happy little laugh inside of him, like bubbles rising in a glass of champagne. "Oh, no; I'm really here," the voice, inaudible but mentally present, assured him. "You can't see me, or touch me, or even really hear me, but I'm not something you just imagined. I'm just as real as ... as Smokeball, there. Only I'm a different kind of reality. Watch." The voice stopped, and something that had seemed to be close to him left him. Immediately, the kitten stopped playing with the crumpled paper and cocked her head to one side, staring fixedly as at something above her. He'd seen cats do that before--stare wide-eyed and entranced, as though at something wonderful which was hidden from human eyes. Then, still looking up and to the side, Smokeball trotted over and jumped onto his lap, but even as he stroked her, she was looking at an invisible something beside him. At the same time, he had a warm and pleasant feeling, as of a happy and affectionate presence near him. "No," he said, slowly and judicially. "That's not just my imagination. But who--or what--are you?" "I'm.... Oh, I don't know how to think it so that you'll understand." The voice inside his head seemed baffled, like a physicist trying to explain atomic energy to a Hottentot. "I'm not material. If you can imagine a mind that doesn't need a brain to think with.... Oh, I can't explain it now! But when I'm talking to you, like this, I'm really thinking inside your brain, along with your own mind, and you hear the words without there being any sound. And you just don't know any words that would express it." He had never thought much, one way or another, about spiritualism. There had been old people, when he had been a boy, who had told stories of ghosts and apparitions, with the firmest conviction that they were true. And there had been an Irishman, in his old company in the Philippines, who swore that the ghost of a dead comrade walked post with him when he was on guard. "Are you a spirit?" he asked. "I mean, somebody who once lived in a body, like me?"