This is a guest post by Aaron. Rendering of “SONG 1” (hirshhorn.si.edu) 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...