And yet, exactly on time, the plane cut calmly through the layer of cloud, and the green hills of England appeared, undeniably true to life, in a light that had suddenly faded, or perhaps I should say deteriorated, because that was my impression: that, as the plane went down, the light was becoming increasingly tenuous, as if it were weakening and languishing, having passed through a filter.

My supervisor had instructed me to take the bus from Heathrow straight to Oxford and apologised several times for not being able to meet me when I arrived as she’d be in London all week at an algebra conference. Far from bothering me, this seemed ideal. I’d have a few days to wander around town and get my bearings, before my academic duties began. I didn’t have much luggage, so when the bus arrived at the station I carried my bags across the square to get a taxi. It was the beginning of April but I was glad I’d kept my coat on: there was an icy, cutting wind, and the pallid sun wasn’t much help. Even so, I noticed that almost everyone at the fair occupying the square, as well as the Pakistani driver who opened his taxi door for me, was in short sleeves. I gave him Mrs Eagleton’s address and as we drove off I asked if he wasn’t cold. “Oh no, it’s spring,” he said, waving towards the feeble sun as if this were irrefutable proof.

The black cab advanced sedately towards the main street. As it turned left, I saw, on either side, through half-open wooden gates and iron railings, neat college gardens with immaculate, bright-green lawns. We passed a small graveyard beside a church, with tombstones covered in moss. The taxi went a little way along Banbury Road before turning into Cunliffe Close, the address I had written down.