Freudian slips: this retrospective reveals that the artist’s ambition was greater than his abilities

This Leonardo show might be lacking in paintings, but it does have a surprise star

Nam June Paik was the father of video art. The riot of noise, colour and vision at Tate Modern shows he was spookily ahead of his time

The artist has been surprising and confounding us with her vivid paintings for 70 years. As a landmark retrospective opens at the Hayward Gallery this week, Waldemar Januszczak visits her at her home