Rachael Finkel and other volunteers organize 70 string instruments, which include violins, a viola and a cello for the Violins of Hope project on March 31, 2023, in Northbrook. (Stacey Wescott / Chicago Tribune) It’s a cardinal rule of history exhibits: Look, don’t touch. Violins of Hope, a touring collection of instruments that passed through Jewish families during and after World War II, has a different philosophy. For the next five months, you won’t just see these instruments around Chicagoland — in libraries, in classrooms, in Jewish community centers and synagogues. You’ll also hear them in the hands of local...