This is a guest post by Aaron. Art fans will focus Thursday night on the outer walls of the Hirshhorn Museum.  Eleven video projectors will paint the Smithsonian's modern and contemporary ring with 360 degrees of a looping film called, "SONG 1."  The Hirshhorn's exterior will become exhibition space as artist Doug Aitken transforms the circumference into an inside-out movie screen.  Just for a few weeks. It all sounds very cool.  But this is a blog about the past.  And there are some fascinating stories about the Hirshhorn's prime spot on the Mall.  The New York Times used their editorial page for a scathing architecture review in 1974.  And did you know that an entirely different museum stood at the same location until 1968?