11-23 May 2010. By Michael Frayn, with Umberto Orsini, Massimo Popolizio, Giuliana Lojodice, directed by Mauro Avogadro. This is a play about two men in a complex relationship who come together in the afterlife to understand their friendship and its strains. These men are not, however, ordinary: they are Niels Bohr and Werner Heisenberg, whose work was foundational in quantum mechanics and atomic physics. The two were also philosophers who considered the connections between scientific knowledge and life. The event they strive to understand is a meeting in occupied Copenhagen during world war two. The meeting was uncomfortable, for Bohr was on one side in the war and Heisenberg on the other. Neither spoke or wrote directly about the event and its impact, both of which have remained a matter of historical speculation, and thus, the emphasis on historicity (or lack of it) dominates discussion about the play.