Lin was never so foolish as to think she could stop being defined by being khepri, as far as the city was concerned. Nor did she want to. But for herself, she stopped trying to be khepri, as she had once stopped trying to be insect. That was why she was bewildered by her feelings about Ma Francine. It was not only that Ma Francine was opposing to Mr. Motley, Lin realized. There was something about a khepri doing that, effortlessly stealing territory from this vile man, that stirred Lin.

Lin could not, even to herself, pretend to understand. She would sit, for a long time, in the shadow of banyans or oaks or pear trees, in the Kinken she had despised for years, surrounded by sisters to whom she was an outsider. She did not want to return to the “khepri way” any more than to the Insect Aspect. She did not understand the strength she drew from Kinken.

Chapter 19

CHAPTER NINETEEN

The construct that had swept David’s and Lublamai’s floor for years seemed finally to be giving up the ghost. It wheezed and spun as it scrubbed. It became fixated with arbitrary patches of floor, polished them as if they were jewels. Some mornings it took nearly an hour to warm up. It was becoming caught in programme loops, causing it to endlessly repeat tiny pieces of behaviour.

Isaac learnt to ignore its repetitive, neurotic whines. He worked with both hands at once. With his left, he scribbled down his notions in diagrammatic form. With his right he fed equations into the innards of his little calculating engine through its stiff keys, slotted punctured cards into its programme slot, fumbling them in and out at speed. He solved the same problems with different programmes, comparing answers, typing out the sheets of numbers.

The innumerable books on flight that had filled Isaac’s bookshelves had been replaced, with Teafortwo’s help, by an equally large number of tomes on unified field theory, and on the arcane sub-field of crisis mathematics.

After only two weeks of research, something extraordinary happened in Isaac’s mind. The reconceptualization came to him so simply that he did not at first realize the scale of his insight. It seemed a thoughtful moment like many others, in the course of a whole internal scientific dialogue. A sense of genius did not descend on Isaac Dan der Grimnebulin in a cold shock of brilliant light. Instead, as he gnawed the top of a pencil one day, there was a moment of vaguely verbalized thought along the lines of or wait a minute maybe you could do it like this . . .