West Berlin, June 1982, and Mick Jagger looks out at the crowd assembled at the city’s Olympiapark Waldbühne amphitheatre. Playing here, in the still-divided Berlin, meant more than a usual show. As he pouted and strutted for the last time that evening, clusters of helium balloons rose up from the stage and high into the night sky, where they would undoubtedly be seen on (if not float over to) the other side of the Wall.
To a young man in the audience, Carlo Karges, the balloons looked like a fleet of otherworldly spacecraft – and that thought started to worry him: "If they look like UFOs to me," he thought, "then maybe someone on the East side is thinking the same…"
