Mud at New City Theater.

Mud at New City Theater. ANYA KAZANJIAN

You’d be forgiven for thinking that Mud, a short and bitter play by María Irene Fornés, is just about poor people. Its three characters look like they’re from a Dorothea Lange photograph—two are literally caked in dirt; one is slightly cleaner in a ratty suit jacket and tie—and the set is a small square of battered wooden floorboards and furniture. But Fornés, an 85-year-old Cuban American playwright known for her work in the avant-garde, is after bigger game: us. Mud is about poor people like Waiting for Godot is about hobos…

Brend an Kiley has worked as a child actor in New Orleans, as a member of the junior press corps at the 1988 Republican National Convention, and, for one happy April, as a bootlegger’s assistant in Nicaragua....