The inventor of modern art caps an amazing year of drawings by old masters, vast 20th-century retrospectives and the return of the YBAs
Not many art exhibitions are truly important. They may be exciting, entertaining, absorbing – but when the dust settles and the posters are covered up with ads for the next unmissable show, nothing has really changed. This is one of the rare exceptions. Paul Cézanne, who died in 1906, has been iconic ever since Picasso and Braque picked up and turned his fraught, hard-won way of looking at apples, mountains and people into the broken mirror of cubism, yet his revolutionary importance is less well understood in the 21st century.