LONDON.- A visitor views postcards at the Royal College of Arts RCA Secret Postcard exhibition in London November 12, 2010. Over 1,000 artists have donated work to the academy show this year, including Tracey Emin, Grayson Perry, Yoko Ono, Jake Chapman, Olafur Eliasson, Yinka Shonibare, Sir Peter Blake, John Baldessari, fashion designers Manolo Blahnik, Mary Quant and Sir Paul Smith, animator Nick Park, photographer David Bailey, film maker Mike Leigh and designers Ron Arad and James Dyson. REUTERS/Stefan Wermuth.