Today, a mystery. Where is this bronze figure of a running man from the Parc des Buttes-Chaumont? Did he simply take off on his own one night and go on running ever faster in the direction of La Villette? Or was he the victim of some other indignity, like the Henry Moore bronze, stolen in Essex and melted down for scrap? The empty plinth has a reproachful air and demands some closure. Somebody, somewhere must know.