Constellations

TNT

Aspects of quantum mechanics and string theory are distilled into an often amusing, increasingly touching sparring match lasting just over an hour in Nick Payne’s playfully clever two-hander. White balloons float above the bare, raised square on which beekeeper Roland and cosmologist Marianne bump into each other, like random molecules.

Every encounter yields a different outcome as their relationship develops – or doesn’t. Some consequences are determined by changing circumstance, others by decisions made in a universe (or parallel universe) where “several outcomes can co-exist simultaneously.” But although many choices can be made along the way, some things remain inevitable.

With its numerous, subtly altered replays Michael Longhurst’s in-the-round production makes considerable demands on the actors and Rafe Spall (down to earth, gentle, straightforward) and Sally Hawkins (nervy, needy, bright) negotiate every nuanced repetition to perfection.

Royal Court Theatre, Sloane Square, SW1W 8AS (020 7565 5000) Tube: Sloane Square Until 11th Feb (£20, Mondays £10) royalcourttheatre.com