In 1985 a few dynamic, aspiring local actors and playwrights knocked down some walls in an old nightclub and mounted a production of Ionesco's Rhinoceros. It was just a one-shot event, or so they thought. More than 23 years, 120 productions and dozens of World, American and New England premieres later, WHAT has built a national reputation for its professional Equity productions, for its provocative choices and its intimate explorations.