What does it mean to say that a form of art is exhausted, that an artist has brought his or her work as far as it can go, that modernism began with Edouard Manet, or that cubism reached a natural ending in 1914 (even if members of that movement continued to paint in a cubist style)? Contemporary theories of art history tend to treat such issues as matters of narrative form, of the manner in which history is represented - with beginnings, turning points...