How exactly does one dramatize a theoretical concept such as the multiverse? It's easy if you're Morgan Freeman with a giant network budget, but for a playwright limited to two actors, a stage, a lighting bank, and sound cues, going beyond the wormhole takes a Big Bang of ingenuity. GableStage audiences received one thanks to director Joseph Adler's stimulating production of Nick Payne's Constellations, a play about a working-class beekeeper (Antonio Amadeo) and an Ivy League physics professor (Katherine Amadeo) who meet at a party. And meet again. And meet once more. And live together — or maybe they don't — and suffer terminal illness and corrosive breakups. Or maybe they don't. Like a dealer shuffling a card deck of infinite possibilities, Adler transitioned his pliable actors through multiple probabilities, shifting consciousness at a moment's notice. Katherine and Antonio Amadeo, married offstage and eternally conjoined in Payne's quantum drama, provided a master class in the subtlety of performance, fully inhabiting all 50 or so shades of reality — even if many didn't last longer than a Vine video. It should have been enough to make Einstein and Sanford Meisner alike smile from the great beyond.