‘Shifters’ Gracefully Shifts Through Time and Memory

Every so often, a moony, moody romance that has earned acclaim on the London stage makes its way across the pond. Two years ago, The Shed revived Lucy Prebble’s “The Effect,” in which two Brits develop feelings for each other while taking part in a clinical drug trial, introduced at the National Theatre in 2012. 2015, the year before that play had initially transferred to New York, saw the Broadway premiere of Nick Payne’s “Constellations,” which offered five variations on a conversation between a physicist and a beekeeper, each taking place in a different realm.