The wheel was brought centre stage, and the dancers leapt on it like you'd jump on to a red, Routemaster bus. Around and around, they clung to its spokes, and then they seemed to race about its hub, sometimes synchronising, sometimes flying freestyle like waltzing trapeze artists. They evoked the languorous back-and-forth of Fragonard's The Swing, and then the knockabout elan of skateboarders and BMX bike riders.