Stewart Laing found inspiration in all kinds of worlds as he designed the set for this large-scale revival of Eugene O’Neill’s 1922 drama “The Hairy Ape,” now at the Park Avenue Armory. There’s the 55,000-square-foot drill hall that pairs boldly with the play’s vivid Expressionist take on labor and inequality. Russian Constructivist art inspired a scene at a union hall, imagined by Mr. Laing as a Communist bookshop in white and red. And then there was hell on earth. A cagelike space — appropriately sulfur colored — is just one of several design elements he discussed on a recent tour of the set. Here are others, with photos taken at a rehearsal.