Slick oil: Richard Wilson's 20:50 at the Saatchi Gallery
Richard Wilson's engine oil-based art work 20:50Photograph: Nils Jorgensen/guardian.co.ukRichard Wilson's art installation 20:50Photograph: guardian.co.ukRichard Wilson's art installation 20:50Photograph: guardian.co.uk
oily reservoirPhotograph: guardian.co.ukA visitor peers into the oily reservoirPhotograph: guardian.co.ukA visitor looks at 20:50, a reservoir containing 8,000 litres of recycled engine oilPhotograph: Ben Stansall/guardian.co.uk
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