Entry: The Twins of no. 19

I call them twins. They may not be twins. They are two women of roughly seventy who leave number nineteen each morning at the same minute, dressed not identically but coordinated, the way a good duet is not unison but is also not chaos. One carries the bag. The other carries the conversation. This division of labour has, I estimate, held for decades, and watching it I have come to believe it is the actual definition of a long companionship: not similarity but allocation. Somebody carries the bag. Somebody carries the talk. The arrangement is invisible to its participants and obvious to a person at a window with a notebook and too much time, which is the person I have apparently become. Field note: the Twins of nineteen do not, as far as I can determine, ever discuss the allocation. It is older than discussion. It is load-bearing in the way of all the best arrangements, which is to say nobody can remember agreeing to it and nobody would survive its collapse.