What is the author's style in Copenhagen by Michael Frayn?

There are no props involved in this play except for three chairs. The main focus is on the three characters and their accounts of the Copenhagen meeting between Heisenberg and Bohr, their discoveries, and their relationships. There is also little action other than the characters sitting and standing or varying their positions as they concentrate on one another. The heart of the play is a long, detailed discussion. No one leaves the stage; they wander off to the side if they are not included in the present conversation.