It is like the dissociative identity disorder plotting of television’s Herman’s Head (1991-1994), James Mangold’s Identity (2003), Johnnie To and Wai Ka-fai’s Mad Detective (2007) and Pete Docter’s Inside Out (2015), except that the multiple aspects of Ethan appear on screen sequentially rather than simultaneously (except in the default, where all are present) – and as Ethan himself points out when Alli suggests that this is DID, “these aren’t personalities – it’s all still me”.