They call the main concert hall La Ballena Azul, "The Blue Whale," and it swims inside a grand Beaux Arts palace where, for most of the last century, folks in Buenos Aires mailed letters: the former Central Post Office. The Blue Whale auditorium — blimp-shaped, three stories high, holding 1,750 people — floats in what used to be the package-sorting area.
Why "floats"? Because the subway runs nearby, says guide Federico Baggio. "So the vibrations would not enter the symphony hall. It ended up having a whale shape, so that's why they named it like that, but the purpose is acoustics http://n.pr/1LbeTUc