On the subject of race, Branden Jacobs-Jenkins is our country’s most original and illuminating playwright. An Octoroon (the 2014 OBIE Award for Best New American Play) is his unclassifiable adaptation of an 1859 melodrama about illicit interracial love. It is, by turns, riotously funny, gut-wrenchingly disturbing, and always brave. It might just be the most challenging drama that I ever staged for Available light.