Ten days ago, the New Statesman and Verso Books collaborated on a screening of Derek Jarman's film Wittgenstein at Tate Modern. After the film was shown, the NS culture editor, Jonathan Derbyshire, talked to Jarman's producer Tariq Ali. A video of their conversation -- which covers the making of the film, Wittgenstein's place in 20th-century thought and the future of philosophy in this country -- can now be viewed on the Tate Modern website.