Tom Johnson (1939) belongs to a rich tradition of artists, from Marcel Duchamp through John Cage, who prefer ‘finding’ to ‘creating’. In Johnson’s case, a surprising musical beauty is found in the regularity, logic and symmetry of pre-existing mathematical structures. A clarity of texture, an ear for transparent harmony and a preference for simple and elegant rhythmical designs are more than mere characteristics of Johnson’s sound world, they are structural determinants that drive the forms themselves.