Each time I caught sight of geese swooping in formation across the sky, I wondered how our life below might look from their perspective, and imagined that, were they ever to indulge in such speculation, the high-rises might seem to them like firs massed in a grove.

One of the difficulties of photography is that it is much better at being explicit than at being reticent.

It's an Obama book, certainly. I was delighted, and astonished, to hear recently that he was reading it. It's a book about a new kind of American reality, one that takes diversity for granted. It doesn't celebrate diversity, actually, it just says: this is how we live now.

But a book suggests conversation: one person is speaking to another, and audible sound is, or should be, natural to that exchange. So I read aloud with myself as the audience, and gave voice to another's words.

We experience life as a continuity, and only after it falls away, after it becomes the past, do we see its discontinuities. The past, if there is such a thing, is mostly empty space, great expanses of nothing, in which significant persons and events float.

You know that this vignette and that vignette belong side by side, you know that a certain turn of phrase you've been saving will probably work best within a given section of the narrative. As in a jazz performance, writing lives or dies by what's produced in that moment. But that moment is attended by long preparation.

It wasn't a deception: all lovers live on partial knowledge.