Lonnie Bunch, founding director of the Smithsonian's National Museum of African American History and Culture, stands in front of the museum on the National Mall in Washington, D.C., July 26, 2016.  The institution is due to open in September. The outer shell, or corona, was designed to match the 17-degree angle of the capstone of the Washington Monument, behind. (photo by Allison Shelley for Smithsonian magazine)