The dead shark floating in a tank was one of the artworks that first brought British artist Damien Hirst to public attention in the early 1990s. It's a well-known, perhaps infamous, work that helped launch his extraordinarily successful career. However, it's the title that has always fascinated me: "The Physical Impossibility of Death in the Mind of Someone Living". I think about that title in the middle of summer, when I find it almost impossible to imagine ever feeling cold