Leslie Waddington, "one of the most powerful contemporary art dealers in Britain", explains the prices of art works in his gallery – David Hockney’s The Room, Tarzana (1967) is about £35,000, one of Christo’s drawings for the Running Fence project (c.1975) about £3000, one by Morris Lewis worth about £45,000, etc. Cork says that modern painters "like Turnbull, Heron and Hoyland" consequently often contract with gallery owners who ensure their work is kept marketable in a "rich man’s ghetto where ‘art’ means merchandise that commands the highest possible profit", but keeps it inaccessible to most people. Waddington thinks that Sunday Working and the others "don’t contain art" and would appeal to purchasers for only a few days before being...