Review: Richard Long: Time and Space, Arnolfini Gallery, Bristol

Richard Long, land artist, has been walking and walking, ceaselessly, for more than half a century. Walking is the basis of his practice as an artist. He takes long walks – in Bolivia, Egypt or Peru, for example – or relatively short walks. Some terrains he has walked again and again: Dartmoor, for example. Much of his art is impermanent. He makes stone circles or lines, and nature blows them away. We know that they once existed because Long photographs them. He uses materials local