Michael Frayn is a playwright and novelist. His new novel, Spies, will be published in April. (March 2002)

‘Copenhagen’ Revisited

Now that Niels Bohr’s famous unsent letter to Werner Heisenberg has finally been published—and for the most part only confirmed commentators in the differing views they already held—I have been looking back over the entire debate that my play Copenhagen seems to have provoked since it was first produced in …