The art of drystone walling - by the path to Totley Bents On Tuesday morning, I undertook the same circular walking route that I have followed four or five times a year for the past thirty five years. According to my "Casio" calculator's advice, that means I have completed the circuit around 150 times. It is located on the southern edge of Sheffield - by car, less than ten minutes from this house. The weather changes, the seasons change and the walk is never quite the same. In those thirty five years there have been many physical changes too. The wooden stable from which two horses used to peer at me has now fallen down and mosses clothe the rotting timbers. A large brick garage has been turned into a swish house down by Blacka Brook. The boy who used to play in the tree house is now most probably a man, building a new tree house some place else for his own children while the old tree house collapses, forgotten. As I walked, I sang a made-up song that is gradually...