Das Kapital at the Arsenale: how Okwui Enwezor invited Marx to the Biennale

Collector billionaires arriving by super-yacht will be greeted by a team of performers reading Das Kapital every day for the next six months. Charlotte Higgins talks to the Venicle Biennale director Okwui Enwezor about revolution, racism and the small matter of Rolls-Royce sponsorship