Isaac Julien's seven-screen installation, which features Franco as an art adviser, revolves around the flow of capital – the unseen director of all our lives

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The city rears up around us, lit windows against the night, the corporate buildings blocking the sky. In an all-white empty office, a hedge-fund manager plays a lonesome trumpet. A skittering drum kicks in, adding an urgent pulse. The pulse is money: capital at work. Ranks of computers and servers churn the numbers in a sub-basement world where the capital flows.

In an auction room, prices are spiralling. Actor James Franco, playing an art adviser, explains how art has become a hedge against money's instability. The price of art has nothing to do with the art itself. In another scene, auctioneer Simon de Pury explains the exponential rise of the art market since the 2008 financial crash. Superstitious, he always...