"I don't know." Nafai walked to the door. "I need some air. I'm running out of air." He walked out of the room. Immediately he felt better. Not lightheaded anymore. What was all that about, anyway? The library was too stuffy. Too crowded. Too many people in there,

"Why did you leave?" asked Issib.

Nafai whirled. Issib was silently floating out of the library after him. Nafai immediately felt the same kind of claustrophobia that had driven him out into the hall. "Too crowded in there," said Nafai. "I need to be alone."

"I was the only person in there," said Issib.

"Really?" Nafai tried to remember. "I want to get outside. Just let me go."

"Think," said Issib. "Remember when Luet and Father were talking yesterday?"

Immediately Nafai relaxed. He didn't feel claustrophobic anymore. "Sure."

"And Luet was testing Father-about his memories. When his memory of the vision he saw was wrong, he felt kind of stupid, right?"

"He said."

"Stupid. Disconnected. He just stared into space." . "I guess."

"Like you," said Issib. "When I pushed you about the meaning of zrakoplov"

Suddenly Nafai felt as if there were no air in his lungs. "I've got to get outside!"

"You are really sensitive to this," said Issib. "Even worse than Father and Mother when I tried to tell them?

"Stop following me!" Nafai cried. But Issib continued to float down the hall after him, down the stairs, out into the street. There, in the open, Issib easily passed Nafai, floating here and there in front of him. As if he were herding Nafai back toward the house.

"Stop it!" cried Nafai. But he couldn't get away. He had never felt such panic before. Turning, he stumbled, fell to his knees.

"It's all right," said Issib softly. "Relax. It's nothing. Relax."

Nafai breathed more easily. Issib's voice sounded safe now. The panic subsided. Nafai lifted his head and looked around. "What are we doing out here on the street? Mother's going to kill me."

"You ran out here, Nafai."

"I did?"

"It's the Oversoul, Nafai."

"What's the Oversoul?"

"The force that sent you outside rather than listen to me talk about-about the thing that the Oversoul doesn't want people to know about."

"That's silly," said Nafai. "The Oversoul spreads information, it doesn't conceal it. We submit our writings, our music, everything, and the Oversoul transmits it from city to city, from library to library all over the world."

"Your reaction was much stronger than Father's," said Issib. "Of course, I pushed you harder, too."

"What do you mean?"

"The Oversoul is inside your head, Nafai. Inside all of our heads. But some have it more than others. It's there, watching what we think. I know it's hard to believe."

But Nafai remembered how Luet had known what was in his mind. "No, Issya, I already knew that."

"Really?" said Issib. "Well then. As soon as the Over-soul knew that you were getting close to a forbidden subject, it started making you stupid"

"What forbidden subject?"

"If I remind you, if it'll just set you off again," said Issib.

"When did I get stupid?"

"Trust me. You got very stupid. Trying to change the subject without even realizing it. Normally you're extremely insightful, Nafai. Very bright. You get things. But this time up in the library you just stood there like an idiot, with the truth staring you in the face, and you didn't recognize it. When I reminded you, when I pushed, you got claustrophobic, right? Hard to breathe, had to get out of the room. I followed you, I pushed again, and here we are."

Nafai tried to think back over what had happened. Issib was right about the order of events. Only Nafai hadn't connected his need to get out of the house with anything Issib said. In fact, he couldn't for the life of him remember what it was that Issib had been talking about. "You pushed?"

"I know," said Issib. "I felt it, too, when I first started getting on the track of this a couple of years ago. I was playing around with lost words, just like that dancing bear thing. Making lists. I had a l&ng list of terms like that, with definitions and explanations after each one, along with my best guess about what each lost word meant. And then one day I was looking at a list that I thought was complete and I realized that there were a couple of dozen words that had no meanings at all. That's stupid, I thought. That's ruining my list. So I deleted all those words."

"Deleted them?" Nafai was appalled. "Instead of researching them?"

"See how stupid it can make you?" said Issib. "And the moment I finished deleting them, it came to me-what am I doing! So I reached for the undelete command, but instead of pushing those keys, I reflexively gave the kill command, completely wiping out the delete buffer, and then I saved the file right over the old one." , "That's too complicated to be clumsiness," said Nafai.

"Exactly. I knew that deleting them was a mistake, and yet instead of undoing that mistake and bringing the words back, I killed them, wiped them out of the system."

"And you think the Oversoul did that to you?"

"Nafai, haven't you ever wondered what the Oversoul is? What it does?"

"Sure."

"Me too. And now I know."

"Because of those words?"

"I haven't got them all back, but I retraced as much of my research as I could and I got a list of eight words. You have no idea how hard it was, because now I was sensitized to them. Before, I must have simply overlooked them, gotten stupid when I saw them-the way Father did when he was getting wrong ideas about the Oversoul's vision. That's how they got on my first list, but without definitions-I just got stupid whenever I thought of them. But now when I saw them I'd get that claustrophobic feeling. I needed air. I had to get out of the library. But I forced myself to go inside. It's the hardest thing I've ever done. I forced myself to stay and think about the unthinkable. To hold concepts in my mind that the Oversoul doesn't want us to remember.

Concepts that once were so common that every language in the world has words for them. Ancient words. Lost words."

"The Oversoul is hiding things from us?"

"Yes."

"Like what?"

"If I tell you, Nafai, you'll take off again."

"No I won't."

"You wtil? said Issib. "Do you think I don't know? Do you think I haven't had my own struggle this past year? So you can imagine my surprise when last night Elemak sits there in the kitchen and explains to us about one of the forbidden things. War wagons."

"Forbidden? How could it be forbidden, it isn't even ancient."

"See? You've forgotten already. The word kolesnisha"

"Oh, yes. That's right. No, I remember that."

"But you didn't till I said it."

That's right, thought Nafai. A memory lapse.

"Last night you and Elemak were sitting there talking about war wagons, even though it took me months to be able to study the word kolesnisha without gasping the whole time."

"But we didn't say kolesnisha."

"What I'm telling you, Nafai, is that the Oversold is breaking down."

"That's an old theory."

"But it's a true one," said Issib. "The Oversoul has certain concepts that it is protecting, that it refuses to let human beings think about. Only in the past few years the Wetheads have suddenly become able to think about one of them. And so have the Potoku. And so have we. And last night, hearing Elemak talk about it, I felt not one twinge of the panic."

"But it still made me forget the word. Kolesnisha,?

"A lingering residual effect. You remembered it this time, right? Nafai, the Oversoul has given up on keeping us away from the war wagon concept. After millions of years, it isn't trying anymore."