This is a post almost a year late but here we go.
Given the nature of the play and the background of war my design and our concept was a timeless un-ending war. Mixing current and past military uniforms, and styles. The main structure was essentially a pile of junk, with meant to reflect a once great building that has been ravaged by war, who's inhabitants have patched and barricaded using anything they can find creating a patchwork defense.
The audience was again on stage with overflow into the house seats, keeping this in mind I added a temporary thrust stage on top of the stairs leading down the stage. The floor design was a little more abstract but was meant to reflect the two warring houses and the points of their swords, which meet in the middle in a metaphorical battlefield. The circle also became a point of importance and power where the witches met, with a focal point for certain effects.
Look for a short sub-post about how I went about creating branches for the soldiers to bring forward as Birnam Wood approached.
An in-progress shot, before the floor and some details were finished.