Denis was my guide to and from the new out-of-town Lidl superstore at Salernes in Provence. I drove. The road was a smooth ribbon of asphalt newly laid through an ancient forest of dwarf oaks. The in-car conversation with Denis was, as usual, easy and undogmatic and wide-ranging, which is the only sort of conversation I am capable of, for I can never remember what my opinions are, let alone which set of beliefs gave rise to them.