IN A flat in a social housing block in London's Pimlico, artist Marcus Coates is being variously nudged, bullied and shocked out of his sense of what is real. Controlling the process is Lucy Dempster, a teenager in recovery from psychosis. In his ear, Coates hears Dempster prompt him in how to behave, when to sit, what to touch and what to think about. Sometimes, Coates asks for guidance, but more often Dempster's reply is drowned out by a second voice, chilling, over-loud, warning him not to ask so many questions.
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