The Sainsbury Exhibition Galleries at the Ashmolean Museum in Oxford aren’t the largest space in the world, and on entry Labyrinth: Knossos, Myth & Realityseems a bit crowded. Keeping one eye on an ancient marble-and-plaster fragmented effigy of a human torso with a bull’s head, you have to work out which way to go in order to negotiate the opening items on display as your eyes adjust to the dim half-light. And then the penny drops. It’s quite a clever start to a show that leads visitors through the legend of the Minotaur, without which the various broken pots and crumbling frescos might seem little more than a dry exercise in the archaeological arrangement of three thousand years of history.