Those films tell you stories with beginnings, middles and ends, but Tsai, a long-standing hero of slow cinema fans, is offering something very different. This is a meditation on the way time flows through our lives, when seconds can stretch into hours and entire months can be swallowed by a single cut. It perhaps goes without saying that you have to be in the mood for it, as does everyone else: if you think hearing a mobile phone ring during Iron Man is bad enough, wait until it happens in the middle of a heartbeat-slowing eight-minute shot of a woman staring at a mural of a mountain lake.