With John Wilson

In Iron Man 3, Robert Downey Jr reprises his role as super-hero of the Marvel comics. The film also stars Gwyneth Paltrow and Rebecca Hall. Naomi Alderman reviews.

More from the Cultural Exchange project, in which 75 leading creative minds share their passion for a book, film, poem, piece of music or other work of art. Tonight ballerina Tamara Rojo selects the pioneering choreographer who inspired her to dance, Mats Ek. At the age of 10 in Madrid, Tamara saw the Swedish choreographer's groundbreaking ballet Bernarda, based on the Lorca play The House of Bernarda Alba.

As a staff photographer for the Magnum agency, Rene Burri captured some of the defining moments of the 20th century. As he publishes a new book of colour photographs, he describes the moment he captured an image of his hero, Pablo Picasso.

Art collector Frank Cohen, who made his fortune by creating a chain of DIY stores, and his business partner Nicolai Frahm are opening a new free gallery in London, on the vast site of a former dairy. Where milk bottles used to be washed and stored, contemporary art from around the world will now hang. They discuss their approach to art collecting, and the desire to put it on show.

Producer Penny Murphy.