Another recurring theme throughout the play is the connection between the material world, governed by the laws of physics and our inner worlds, governed by rules of the heart alone.
"A particle, when observed, changes its behaviour." Margrethe intones as she shrewdly but silently observes Bohr and Heisenberg as they awkwardly attempt small-talk.
"Doubt always cast a shadow on your thinking. That is why you discovered the uncertainty principle." Bohr reproaches the impetuous Heisenberg as he boasts about his impulsive strategies - strategies that helped him win not only skiing contests but also the woman who wud be his wife.
"You always assume the worst about people, and then you decide to forgive them for it. Complementarity is in your very nature." a crestfallen Heisenberg bristles at Bohr as he brings up a discredited former student.
It is as if we were nothing but extrapolations of the billions of subatomic particles that constitute the behemoths that are our bodies - our actions as random and chaotic as anything else in the quantum world. This is at one point rather vividly illustrated as Heisenberg and Bohr pretend to be electron and photon - colliding in the darkness, spiralling away, forever changed by their singular interaction.
As for the characters, it is, of course, incredible to view famous scientists whose names have become by-words for theories and principles in physics textbooks come so forcefully to life as people in whose hands and in whose minds lay the key to saving or dooming the lives of millions of people, the key to changing the face of the twentieth century, and the outcome of the Second World War.
"Theoretical physicists are of no use in wartime. They are yet to find a way to kill people using theoretical physics." jokes Bohr at the beginning of the play. And an hour later, we learn that this very man, a half-Jewish proponent of quantum mechanics, which Hitler called "Jewish science", forced to flee his country in the face of the Holocaust would have a hand in building the two atom bombs that wrought such death and destruction as the world has scarcely seen.
The characters are brilliant men but they are played by actors who seem to follow not from the at-times assiduously scientific language of the play but from the deeper feelings behind it. Tom Alter plays Niels Bohr with a defeated air, a man who sees no hope in the world and who assumes only the very worst of his former friend.
Heisenberg is played by an actor who, unfortunately for the character, goes for breadth over depth. As a result, this Heisenberg is hapless, but not haunted. He is bright but not clever. He is confounding but never enigmatic. He is at his best in the scene where he recalls his childhood in a defeated, war-ravaged Germany, a memory that strengthens his resolve to do everything in his power to prevent Germany's defeat in yet another war.
Margrethe seemed most perfectly formed to me. A woman who stays mostly in the background of the play but sees with most clarity what happens in the foreground of her life and the lives of those around her.
My favourite part of the play was a monologue in the second act, where Bohr explains to us that in the early 20th-century was born an idea that humanized physics like never before. Einstein's relativity theories that restored man's place at the center of the universe. "That measurement is not an impersonal event that occurs with universal impartiality", but "a human act that had meaning only when carried out from a specific point of view in time and space."
Thus, man can stand at the center of the universe and while he can see all the world, he cannot see what lies behind his eyes. This fundamental unknowability of people, even and especially to themselves, is an important idea the story plays with. If man is indeed the measure of the universe, then nothing is really quantifiable. This is a surprising idea, my favourite from the several brilliant ideas the play threw up.
And as the evening comes to an end, we realize the three characters have brushed against each other in such different combinations that this friction has caused them to each emerge more clearly. At the end, we have come to know them all, from the inside out - rather than the reverse.
There is so much thought here, even when we choose to look past the layers of the science and the politics, we find the fervid, ambivalent father-son relationship between the two men. The sharp marital protectiveness and the simultaneous subtle resentment that Margrethe possesses, the pain of the loss of a child, the personal tragedy of war and how it scars forever even those that survive it bodily unharmed.
By the end, what they transmit to us most, is their spirit of ravenous curiosity. We may yet learn the secret ways of strings and quarks but we cant ever know exactly who we are, or why we do what we do. Our motives and intentions are often shrouded in ambiguity, moreso than the fate of Schrodinger's famous cat. Our memories are as unreliable and dynamic as an electron on its unpredictable trajectory.
As we witness the different permutations and versions of what may have happened on that September evening in Copenhagen in 1941, we learn that definite knowledge is probably unattainable in "Copenhagen". But how much more interesting life is, as a result. You know, that familiar letdown as you reach the end of the story in a mystery novel? Well, you wont find that here. In the world of "Copenhagen", no such anticlimaxes exist. The thrill of the chase is infinite.
P.S. Heisenberg, ever ebullient father of the Uncertainty Principle, has an epitaph over his grave that reads 'He lies somewhere here.' Uncertain in death as in life.
P.P.S. A friend who watched the play the same evening as me and who sat beside me in the latter half of the play, whose post pushed me to finish my own has perhaps a clearer, more elegant set of thoughts.
Here.