Klaus Frahm's The Fourth Wall: A new theatrical perspective - from the depths of backstage

The fourth wall is the imaginary structure that runs across the front of a stage, allowing actors to inhabit their own world and ignore the audience – as if there is a wall between them. It's also the name of photographer Klaus Frahm's series of shots of theatres across his native Germany. Only in his work, the fourth wall is very visible: it is the auditorium itself.