It sounds like an assignment for a second-grade art project: Choose an animal’s body part — a tusk or a beak or, say, a turtle shell — and create a whimsical, imaginary animal incorporating that body ...

Picture this: A goldfish swimming in a square tank on wheels as it rolls deliberately from one side of a room to the other. It's not a scene from a children's book or a futuristic movie. It's an ...