The thirteenth tape was fed into the altar, and the machinery began to whine, then to whir, and then to rumble. The images appearing above the stage flourished into wilder and more exotic forms than any they had seen yet, and watching the faces of the priest and the acolytes, Princess Nell could see that even they were surprised; they had never seen anything of the like before. As the minutes wore on, the images became fragmented and bizarre, mere incarnations of mathematical ideas, and finally the stage went entirely dark except for occasional random flashes of color. The Wizard had worked itself up to such a pitch that all of them felt trapped within the bowels of a mighty machine that could tear them to shreds in a moment. The little altar boy finally broke away and fled down the aisle. Within a minute or so, the acolytes, one by one, did the same, backing slowly away from the Wizard until they were about halfway down the aisle and then turning away and running. Finally even the high priest turned and fled. The rumbling of the machinery had now reached such a pitch that it felt as though an epochal earthquake were in progress, and Nell had to steady herself with a hand on the altar. The heat coming from back in the machine was like that from a forge, and Nell could see a dim red light from deep inside as some of the pushrods became hot enough to glow.
Finally it all stopped. The silence was astonishing. Nell realized she had been cringing and stood up straight. The red glow from inside the Wizard began to die away. White light poured in from all around. Princess Nell could tell that it was coming in from outside the diamond walls of the keep. A few minutes ago it had been nighttime. Now there was light, but not daylight; it came from all directions and was cool and colorless.
She ran down the aisle and opened the door to the anteroom, but it wasn't there. Nothing was there. The anteroom was gone. The flowery garden beyond it was gone, and the horses, the wall, the spiral road, the City of King Coyote, and the Land Beyond. Instead there was nothing but gentle white light.
She turned around. The Chamber of the Wizard was still there.
At the head of the aisle she could see a man sitting atop the altar, looking at her. He was wearing a crown. Around his neck was a key-the twelfth key to the Dark Castle. Princess Nell walked down the aisle toward King Coyote. He was a middle-aged man, sandy hair losing its color, gray eyes, and a beard, somewhat darker than his hair and not especially well trimmed. As Princess Nell approached, he seemed to become conscious of the crown around his head. He reached up, lifted it from his head, and tossed it carelessly onto the top of the altar.
"Very funny," he said. "You snuck a zero divide past all of my defenses."
Princess Nell refused to be drawn by his studied informality. She stopped several paces away. "As there is no one here to make introductions, I shall take the liberty of doing so myself. I am Princess Nell, Duchess of Turing," she said, and held out her hand.
King Coyote looked slightly embarrassed. He jumped down from the altar, approached Princess Nell, and kissed her hand. "King Coyote at your service."
"Pleased to make your acquaintance."
"The pleasure is mine. Sorry! I should have known that the Primer would have taught you better manners."
"I am not acquainted with the Primer to which you refer," Princess Nell said. "I am simply a Princess on a quest: to obtain the twelve keys to the Dark Castle. I note you have one of them in your possession."
King Coyote held up his hands, palms facing toward her.
"Say no more," he said. "Single combat will not be necessary. You are already the victor." He removed the twelfth key from his neck and held it out to Princess Nell. She took it from him with a little curtsy; but as the chain was sliding through his fingers, he tightened his grip suddenly, so that both of them were joined by the chain. "Now that your quest is over," he said, "can we drop the pretense?"
"I'm sure I don't take your meaning, Your Majesty."
He bore a controlled look of exasperation. "What was your purpose in coming here?"
"To obtain the twelfth key."
"Anything else?"
"To learn about Wizard 0.2."
"Ah."
"To discover whether it was, in fact, a Turing machine."
"Well, you have your answer. Wizard 0.2 is most certainly a Turing machine-the most powerful ever built."
"And the Land Beyond?"
"All grown from seeds. Seeds that I invented."
"And it is also a Turing machine, then? All controlled by Wizard 0.2?"
"No," said King Coyote. "Managed by Wizard. Controlled by me."
"But the messages in the Cipherers' Market control all the events in the Land Beyond, do they not?"
"You are most perceptive, Princess Nell."
"Those messages came to Wizard-just another Turing machine."
"Open the altar," said King Coyote, pointing to a large brass plate with a keyhole in the middle.