This is what you see on the outside, approaching Punchdrunk’s Sleep No More. What you see on the inside – or, more properly, what happens to you on the inside – I wouldn’t dream of spoiling by commentary.  What I can note is that the experience had all the immediacy and menace of a dream, and that I’ll remember the moment of being put out of the elevator to stand alone in the dark, echoing, but very much inhabited hallway, as one of the most exquisite and fantastical I have ever had at, in, the theatre. What a performance. We aspire – and plan – to bring the same level of fiendish detail and passionate immersion to the stage version of Under the Poppy.