He scowled. "No! All of this follows logically from the Keystone's information content at the Aleph moment—it's not a prediction of the Keystone's thought processes. Do you imagine that… the Keystone has to count from one to a trillion—out loud—to create all the numbers in between, before arithmetic can make use of them? No. Zero, one, and addition are enough to imply all of them, and more. The universe is no different. It just grows out of a different seed."

I glanced at the others. They were watching the screen with uneasy fascination, but no sign of anything remotely like religious terror. They might have been observing a runaway Greenhouse climate model, or a simulation of a meteor strike. Secrecy had insulated these people from any serious challenges to their ideas, but they still clung to some semblance of rationality. They hadn't plucked the supposed need to kill Mosala out of thin air, and then invented Anthrocosmology after the fact, to justify it. They really did believe that they'd been forced to this unpalatable conclusion by reason alone.

And maybe the same relentless logic could still be used to change their minds. I was an ignorant outsider, but they'd invited my scrutiny for the sake of explaining their actions to the world. They'd brought me up here so they could argue their case for posterity, but if I accepted their terms as given, and argued back at them in their own language… maybe there was still a small chance that I could inject enough doubt to persuade them to spare Mosala.

I said carefully, "All right. Logical implication is enough; the Keystone doesn't have to think through every last microscopic detail. But wouldn't ve still have to sit down, eventually, and at least… map out the full extent of whatever vis TOE implies? And satisfy verself that there were no loose ends? That would still be a lifetime's work. Maybe the race to complete the TOE is only the first step in the race to become the Keystone. How can anything be explained into being, until the Keystone knows that it's been explained?"

Five cut me off impatiently. "A Keystone with a TOE is inexplicable without all of human history, and all prior human knowledge. And just as every biological ancestor or cousin requires their own quota of space and time to inhabit and observe—their own body, their own food and air, their own patch of ground to stand on—every intellectual predecessor or contemporary requires their own partial explanation of the universe. It all fits together, in a mosaic reaching back to the Big Bang. If it didn't, we wouldn't be here.

"But the Keystone's burden is to occupy the point where all explanations converge into a kernel concise enough to be apprehended by a single mind. Not to recapitulate all of science and history—merely to encode it."

This was futile. I couldn't beat them at their own game; they'd had years in which to ponder all the obvious objections, and convince themselves that they'd answered them. And if mainstream ACs sharing almost the same mindset hadn't been able to sway them, what hope did I have?

I tried another angle. "And you're happy to believe that you're nothing but a bit player in some jumped-up TOE theorist's dream? Dragged into the plot to save ver from having to invent a way for intelligence to evolve in a species with only one member?"

Five regarded me with pity. "Now you're talking in oxymorons. The universe is not a dream. The Keystone is not… the avatar of some slumbering god-computer in a higher reality, threatening to wake and forget us. The Keystone anchors the universe from within. There's nowhere else to do it.

"A cosmos can have no more solid foundation than a single observer's coherent explanation. What would you consider less ethereal than that? A TOE which is simply true—for no reason? And what would we be, then? A dream of inanimate pre-space? Figments of the vacuum's imagination? No. Because everything is exactly what it seems to be, whatever underlies it. And whoever the Keystone is, I'm still alive, I'm still conscious"—he kicked the leg of my chair—"the world I inhabit is solid. The only thing that matters to me is keeping it that way."

I turned to the others. Three was gazing at the floor; he seemed embarrassed by the whole unnecessary business of trying to justify anything to an ungrateful world. Nineteen and Twenty regarded me hopefully, as if expecting that the stupidity of my reluctance to embrace their ideas would dawn on me at any moment.

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