Childhood smells of perfume and brownies.

We all spend so much time worrying about the future that the present moment slips right out of our hands. And so all we have left is retrospection and anticipation, retrospection and anticipation. In which case what's left to recall but past anticipation? What's left to anticipate but future retrospection?

In a memoir, I think, the contract implies a certain degree of truth. I think you have to be as true to your memory and your experience as you possibly can.

Childhood smells of perfume and brownies.

You are not supposed to get it. It's a paradox. All of mathematics is built on paradoxes. That's the biggest paradox of all-all this orderliness, and at the heart, impossibility. Contradiction. Heaven built on the foundations of hell.

'You might think of combinatorics as a machine too', the major says. 'A different sort of machine, though. Have you heard of Babbage's analytic engine? He never built it. ... I have an analytic machine of my own-right here.' He taps his own skull.

It is so common to write autobiographical fiction in which your own experience is thinly disguised.