We saw The Eradication of Schizophrenia in Western Lapland by Ridiculusmus that is to say, David Woods and Jon Haynes not so long before the Great Fire of the Battersea Arts Centre.
The stage is split into two with a see-through curtain dividing it. The audience is divided into two groups, one for each side of the stage, you focus on what is happening on your half, knowing that you will swap at interval. But of course it is impossible to ignore the other side of the stage, a bit hazy, a but unclear, but something is going on there, right?
It is a compelling piece of theatre.