Rumi with a view
Imprisoned in history in The Persian Quarter. Photos: Megan MooreThere's a lot wrong with Kathleen Cahill's The Persian Quarter (at the Merrimack Rep through October 9). Its structure is unwieldy, and it doesn't always have a forceful dramatic engine; and sometimes its timeline shifts simply so some political point or other can be made (and then, alas, too quickly dropped). It also never really inte…