There are a number of successful contemporary artists whose work sells for millions of dollars. But how many of them will leave an enduring mark when the clamour of fashion and hype has moved elsewhere? Hardtalk speaks to one of Britain's best known and controversial artists Marc Quinn. He sculpts, he paints, he manufactures extraordinary objects, and sometimes he enrages the critics - but will his work stand the test of time?(Photo: Artist Marc Quinn poses with a maquette for his Fourth Plinth proposal entitled Alison Lapper Pregnant. Credit: Getty Images)