Audacious risktaking in the theater comes in many colors, most of them loud. You can defy a censor, transgress a casting convention, shatter a shibboleth, violate a hallowed genre tradition, inject “low” or outsider influences, force structural change in a stodgy institution—the possibilities are legion. Every once in a while, though, a specially innovative artist like Will Eno appears whose audacity is instead quiet and understated. It involves dispensing with almost all the