What is the author's style in The Basic Training of Pavlo Hummel by David Rabe?

Rabe's play makes use of multiple spaces on the stage with fluid changes between them and the interweaving and occasional overlapping of scenes. The sparse, abstract set design allows for rapid changes between scenes by merely suggesting different locales on different parts of the stage. The setting both facilitates the movement of scenes in Rabe's distinct dramatic structure and is itself an element of the play's expressionism.