“Brace yourself,” Janet Cardiff said to me politely. “Here comes the big boom.”

It was an overcast Tuesday evening in Kassel, Germany, and I was sitting in a cramped, cluttered trailer at the edge of a forest with Cardiff and George Bures Miller, her husband and collaborator of nearly 30 years, trying to make myself heard over the sound of artillery fire. The idyll of the twilight woods around us was being severely compromised, just then, by what might reasonably have passed for the soundtrack of the end of the world: the droning of airplanes and the shouting of soldiers and the thunder of bombshells detonating on every side. Miller and Cardiff were sipping Earl Grey tea and observing me with quiet amusement. “Kind of like being a war correspondent, isn’t it?” Miller said with a grin.