When you enter the Abelson auditorium of the Court Theatre to view renowned British playwright Caryl Churchill’s play “Fen,” you can’t help but be astounded by its monstrous set.Designed by Collette Pollard, the set fills the entire stage and runs from floor to ceiling. It’s meant to depict the dark and dreary landscape of a region on England’s East Coast, which is known as the Fenlands, or Fens.With its stark gray background, prison-like walls and a barren patch of real dirt stretching to the edge of the stage apron, it …