What does immersive theatre `dö?By contrasting two specific performances on the same theme - one an 'immersive' experience and the other a more conventional theatrical production - Nandita Dinesh explores the different ways in which theatrical form impacts upon actors and audiences. An in-depth case study of her work Pinjare (Cages) sets out the `hows¿ and `whys¿ of her specific aesthetic framework.Memos from a Theatre Lab places Dinesh¿s practical work within the context of existing analyses of immersive theatre, using this investigation to generate an underpinning theory of how immersive theatre works for its participants.