Memories of the past ebb and flow around me like a fast-running stream. Here and there, I pick out snatches of melody, laughter or tears, heartache or guilt. Occasionally, small groups clump together in eddies, circling round, threatening to drag me into the whirlpool of emotion of a particular moment; a birth, a death, singing with joy until my voice is hoarse. I linger at each of these, but the need for closure presses me onward.

This is my personal Hall of Ancestors and, as I walk its length, portraits on the wall show each reincarnation; the twenty-first century social media star, the patent office clerk, the eighteenth-century Swiss craftsman. Here, a rural Italian mother garnishes a steaming pasta dish, and there a mediaeval herbalist offers a concoction of their own devising that claims to be a panacea for any illness from a sore throat to parasitic infections.