You’ve almost certainly seen the shingled building, sitting obvious yet unobtrusive between the dentist and the hair salon on Upper Main street in Edgartown. Perhaps you have heard the skinny: that it’s a dance studio built by a fabulously wealthy man so his daughter, an aspiring ballerina, would have a place to take private lessons for two weeks every summer. According to this tale, the hotel-sized building sits empty the other 50 weeks of the year, and the daughter gave up dancing to study political science anyway.