“Hmm,” Sax said, glancing at her. “I must admit I’d rather have something solid crop up. Something like Einstein’s Mercury— a known discrepancy in the previous theory, which the new theory resolves.”

“Some people would say that the missing shadow matter fills that bill.”

“Possibly.”

She laughed. “You need more, I can see. Perhaps some kind of thing we can do.”

“Not necessarily,” Sax said. “Although it would be nice, of course. Convincing, I mean. If something were better understood, so that we could manipulate it better. Like the plasmas in fusion reactors.” This was an ongoing problem in another lab at Da Vinci.

“Plasmas might very well be better understood if you modeled them as having patterns imposed by spin networks.”

“Really?”

“I think so.”

She closed her eyes— as if she could see it all written down, on the inside of her eyelids. Everything in the world. Sax felt a piercing stab of envy, of— loss. He had always wanted that kind of insight; and there it was, right in the boat beside him. Genius was a strange thing to witness.

“Do you think this theory will mean the end of physics?” he asked.

“Oh no. Although we might work out the fundamentals. You know, the basic laws. That might be possible, sure. But then every level of emergence above that creates its own problems. Taneev’s work only scratches the surface there. It’s like chess— we might learn all the rules, but still not be able to play very well because of emergent properties. Like, you know, pieces are stronger if they’re out in the center of the board. That’s not in the rules, it’s a result of all the rules put together.”

“Like weather.”

“Yes. We already understand atoms better than weather. The interactions of the elements are too complex to follow.”

“There’s holonomy. Study of whole systems.”

“But it’s just a bunch of speculation at this point. The start of a science, if it turns out to work.”

“And so plasmas, though?”

“Those are very homogeneous. There’s only a very few factors involved, so it might be amenable to spin-network analysis.”

“You should talk to the fusion group about that.”

“Yes?” She looked surprised.

“Yes.”

Then a hard gust hit, and they spent a few minutes watching the boat respond, the mast sucking in sails with a bit of humming until they were reset, and running across the strengthening breeze, into the sun. Light flaked off the fine black hair gathered at the back of Bao’s neck; beyond that, the sea cliffs of Da Vinci. Networks, trembling at the touch of the sun— no. He could not see it, with eyes open or closed.

Cautiously he said, “Do you ever wonder about being, you know. Being one of the first great women mathematicians?”