Jimmie Durham is showing two works. The first, created for the Biennale, brings a scaffolding and CCTV cameras together in an unexpected pairing of objects with opposed uses and symbolism. The first is gleaming and factory-fresh, the standard equipment you see adorning walls being built or refurbished. The second is usually hidden, being intended to keep us under surveillance. Together they add up to a strange system: who’s building what, who’s spying on whom? Further along Durham offers "Thinking of You": a perch with an aluminium vulture on it. The bird of prey’s silhouette stands out haughtily against the light, playing the guardian of the established order more surely than all the cameras in the world.