Kirsty Wark Meets Artist Bridget Riley

Celebrated artist Bridget Riley shot to fame in the 1960s with a series of black and white geometric artworks and has just opened a new show in London at the age of 90. In an exclusive interview with BBC Newsnight, she talks to Kirsty Wark about her childhood in Cornwall and the impact of war on her art, on learning from her own mistakes, and on the importance of studio space for young artists.