I’d heard great things about, but never got to see, Nick Payne’s two-hander play “Constellations” featuring a cosmologist, a bee-keeper, and branching scenes to show the many alternative ways their story could have gone.
More on drama branching and switching - both in Constellations and potentially on Middle Earth - in a new Eclectic Stacks blog post here: https://www.eclecticstacks.com/post/constellations-branching-and-switching-plays/