Think back to the famous 1983 movie "Flashdance" and answer the question, "What was it about?' You will probably respond that it's about a young girl named Alex, a steelworker who dances in an almost strip club and wants to get into an elite-level ballet school. But that's not the right answer if someone asks you about the busy stage musical adaptation of "Flashdance" that opened Tuesday night at the Marcus Center.