“Sometimes, you feel yourself weightless, thinned. You draw back the curtains (if there are any) on a rectangle of wasteland at dawn, and realise that you are cast adrift from everything that gave you identity. Thousands of miles from anyone who knows you, you have the illusion that your past is lighter, scarcely yours at all. Even your ties of love have been attenuated (the emergency satellite phone is in my rucksack and nobody calls). Dangerously, you may come to feel invulnerable.”