Time unravels in this hypnotic audio journey... In this edition of Slow Radio, we tumble inside the delicate mechanism of the clock - our attempt to contain and mark the steady rush of time itself. Musical and rhythmic, this surreal audio composition moves between the meditative beat of a single timepiece through to a cacophonous eruption of melodious chimes and cuckoos. The Clock will air just after Big Ben's midnight chimes play out on the BBC, 100 years after London's most famous clock was first broadcast on New Year's Eve 1923. Featuring audio first recorded for the documentary Time Flies on BBC Radio 4, as well as new recordings and compositions built from the sounds of Big Ben's internal mechanism and ringing bells. Produced by Eleanor McDowall A Falling Tree production for BBC Radio 3