There is a subtle, slow-burning power to the word premiere of Zinnie Harris’s Supposing: at the Traverse Theatre. Modern-day Cassandra Sally, played for the most part with brilliant precision by Nicole Cooper, is our guide through this surreal nightmare. “I’m a rational person, I used to be a manager for f**k’s sake,” she exclaims – the three words “used to be” turning the sentence on its head. Centred on a single white circle and a small, inconsequential lamp, the design lets simple, subtle details do heavy emotional lifting. In a blistering, incisive moment, Sally asks what if a man had been given this gift, exposing how her status as a woman turns foresight into a curse.