Neil MacGregor sums up the evidence in wide-ranging inquisition into the role of art

The jury recognised the multimedia artist’s “coherence” over 20 years of work

Art is put in the witness box for The Art Newspaper’s 25th anniversary celebrations

PLUS: The beat goes on for Anri Sala at Frieze, Grayson Perry goes head-to-head with Mondrian, Michael Landy woos Glenn Brown, and more fair gossip

PLUS: Mark Leckey's work is feline fine, art for the brain, art for the body, silent nude delights and unnerves Frieze visitors, and more fair gossip

PLUS: Get your private parts painted in public at Frieze, dealers have their say on if Renoir is crap, working the aisles with Graham Norton and David Furnish and more fair gossip

The artist worked with her husband for nearly 50 years