A play in letters from Elizabeth Bishop to Robert Lowell and back. By Sarah Ruhl. Directed by A. Nora Long. Told through the extensive correspondence between two of the 20th century’s most important and celebrated American poets, Dear Elizabeth is a different kind of love story, of artists and friends. Bishop and Lowell's thirty-year friendship served to buoy each other up in life and art, each being profoundly impacted by the other. Celebrated playwright Sarah Ruhl weaves a lyrical, moving…