Details 316 came from Chardin's Glass of Water and Jug (1760). The picture is in the Carnegie Institute Museum of Art, Pittsburgh.
The winners were: Jed Falby of Salterton, Devon; Michael Langdon of London SW1; and Chris Parsons of Huddersfield.
Each will receive a bottle of champagne, as will this week's winners. Answers on a postcard (to arrive by Wed 8 Jan) to: DETAILS 318, Arts Desk, IoS, 1 Canada Square, London E14 5DL.