Hounded by memories of ghetto life, Arie Kasiarz hadn’t been able to sleep.

He rarely talked about his hardships during the war, once fainting at the United States Holocaust Memorial Museum. The Philadelphian preferred to focus on the living, so rising from his hotel bed he bathed before dawn, dressed carefully in a crisp brown blazer, and was standing at the ready when his son came to collect him.

Now, as rain poured outside the Museum of Fine Arts, Kasiarz, 90, clutched some of those memories in a white plastic bag: a pair of tattered photographs from his life during World War II. He’d traveled here to brave “Memory Unearthed,” an exhibition of Henryk Ross’s photographs from Poland’s Lodz Ghetto, where Kasiarz, a Jew, had lived during the German occupation.“I get sick if the memory comes back to me,” said Kasiarz, who entered the ghetto with his parents and two sisters when he was 12. “I can forget what I ate yesterday, but I can’t forget what I got through in the ghetto.”