It is at Barbican Centre Pit Theatre, when the voice inviting us inside warns “there is a risk of death, but then, it is inevitable” that the audience seem to look at the white coats and goggles handed out to wear, and half wonder if there will be blood tonight. Welcome to The Machine, by Collectif and Then… a meticulously planned, at times confusing, and thoroughly fun show, blending acrobatics, installation, and performance art.