"Manifesto Marathon" is the third in Hans Ulrich Obrist's series of Marathon events at London's Serpentine Gallery. Coming at a moment when manifestos, having ceased to spearhead artistic movements, seem ripe for reinvention, "Manifesto Marathon "collects statements and declarations of all kinds from artists and contributors from the worlds of literature, design, science, philosophy, music and film. Highlights include Nicolas Bourriaud's "Altermodern," Paul Chan's "Sex and the New Way, V.I.," Jimmie Durham's "No More Silly Hats," Fritz Haeg's "London: A Manifesto From Your Animals," David Hockney's "Manifesto for Smoking," Adam Pendleton's "Black Dada," Agnès Varda's "What To Do?," Ben Vautier's "I Don't Know What To Do," Ai Wewei's "Despicable Things," Vivienne Westwood's "AR," Lebbeus Woods' "Slow Manifesto," plus interviews with Eric Hobsbawm and Tino Sehgal, and a wealth of photographs from the event.