“The small staff of the World Trade Center Memorial Museum faces a few challenges as it prepares to commemorate the fifth anniversary of the terror attacks of September 11, 2001. The museum has no gallery space and little storage area. It has barely even started collecting. Still, it has a public mission to help Americans remember. ‘We have this conundrum — we are not a museum yet, but we have to start acting like one,’ the chief curator, Jan Ramirez, said.” So, “this week, the museum will open its first exhibition: a series of largescale photographs that will be installed on the chain-link fence on east side of the World Trade Center site.”