DINOSAURS have been an enduring fascination for humankind since the first giant bones were unearthed from the ground. What did these creatures look like? How did they live? The mystery created by their extinction has made these ancient beings immortal. The soaring size of sauropods and the mythic power of the T. Rex have captured the imagination and passion of children and adults alike, in part because they must be imagined. This fact has fostered an amazing cooperation between science and art: