I read Doris Lessing’s The Four-Gated City in 1969, when it was published, and I have a hardback first edition of it, still in its original dust wrapper. When I rediscovered my copy and reread it in the autumn of 2019, to prepare for a seminar at the University of East Anglia to celebrate her centenary, I found that I had been using a bus ticket as a bookmark. I must have been reading it on the No. 24 bus, on my way to or from South End Green in Hampstead. I had forgotten what London bus tickets looked like. The printing was a pale mauve. I couldn’t read that volume on a bus now. It is far too heavy. I can hardly read it in bed.