"I can't see you," he said.
"Of course, you can't," snapped the voice. "That's because I'm looking at you. Oh, all right, I'll turn, although I don't know why I should."
Then in front of Kevan's eyes there suddenly appeared a little man, no more than two feet high. His face, in profile, was sharp and pointed.
"How did you do that?" Kevan asked with interest.
"Do what?"
"You were invisible. Then suddenly you were visible."
"I wasn't anything of the kind," the little man said. "I was merely looking at you. When I'm looking at you, you can't see me. When you can see me, I can't see you—but I don't start making nasty cracks about you being invisible."
"Why?"
"Because I'm good-natured," grumbled the gnome.
"No, I mean why can't I see you if you're looking at me?"