Rowan Moore: the best architecture of 2015

From dumb towers to cool interventions, 2015 saw the gap widen between the big and brainless and the small and thoughtful

Observer critics’ reviews of the year in full

Laura Cumming: the best art of 2015

It was a wonderful year, as Goya’s extraordinary portraits got together, Ai Weiwei broke free and Eric Ravilious took us to the skies

Observer critics’ reviews of the year in full