Scottish sculptor, born in Fife. He studied at Duncan of Jordanstone College of Art and the Royal College of Art. He has been identified with the New British Sculpture because of his use of ordinary objects. He accumulates these into representations of other objects, most spectacularly and controversially with Polaris, a full-size submarine made out of tyres which was exhibited outside the Hayward Gallery, London, in 1983. Mach has said that the work had a political element, being a comment on Britain's defence budget. He has also made use of objects usually identified as kitsch, in works such as 101 Dalmatians (1988), in which painted plaster dogs are interspersed with furniture. More abstract are the sculptures made from magazines piled up in wave-like forms, such as Fully Furnished (1994). This work also incorporates a model horse and a mildly erotic nude painting. The obvious ingenuity of much of his work makes it more accessible to a wide public than that of many of his contemporaries.