So what is Copenhagen about? Ostensibly it’s about what happened at a mysterious meeting that took place in the Danish capital during World War Two between two of the great quantum theorists- Heisenberg, he of the Uncertainty Principle, and Bohr, who united the two main theories of quantum mechanics. Yes, but what’s it really about?

On the face of it, the play is about three dead people, ghosts if you like- Heisenberg, Bohr and Bohr’s wife- trying to work out between them what happened back in 1942. They keep going over the same ground with different results, and reveal all sorts of interesting things along the way. Appropriately to a play involving Quantum Theory, there are possibilities, probabilities and, above all, uncertainty. In fact the fluid time and colliding dialogue of Michael Frayn's play and Michael Blakemore’s bare production which makes the characters seem like protons in the nucleu of an atom give us insights into Quantum Theory.

So here are my thoughts on the possibilities, probabilities and uncertainty of what I saw.

Looking at it one way, the play is about history and science and how the two interlink. Quantum Theory led to nuclear fission which led to the atomic bomb- and a race between Germany and the Allies to create it.

Looking at it another way, it's about the moral dilemma felt by a theoretical scientist wanting to help win a war but working on a weapon of mass destruction to achieve that victory. Did the meeting affect the outcome of the war?

Then again, the play is about how time and memory work: what happened is always gone and replaced by an unreliable memory influenced by subsequent events. And the impossibility of seeing yourself and your life objectively because you are the centre of your universe.

You could say the play is about how people and relationships affect history and science. How jealousy, rivalry, fear, ambition and personal tragedy play their part. Charles Edwards as Heisenberg gives us a moving account of a life under the Nazis. Patricia Hodge and Paul Jesson are his equal in acting power.

You might come out thinking mainly about how impressive it is that an intelligent well written drama can put across all the above.

To go back to quantum theory, Copenhagen could be about how the act of observation changes what’s being observed. My experience might have been different on a different night but when I observed it, I thought Copenhagen at the Minerva Theatre deserved five stars.

Copenhagen is at the Minerva Theatre until 22 September 2018. Versions of this review appeared on the YouTube channel One Minute Theatre Reviews and on the website oneminutetheatrereviews.co.uk