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A visitor listens to interviews with family members and close friends of victims. Present Absence is a five-channel video installation created by Salome Chasnoff and Meredith Zielke. (Xiaozhang (Shaw) Wan/MEDILL)

A visitor listens to interviews with family members and close friends of the victims. Present Absence is a five-channel video installation created by Salome Chasnoff and Meredith Zielke. (Xiaozhang (Shaw) Wan/MEDILL)