Could you spot a Julian Opie from a Grayson Perry? Take the RCA Secret challenge and you could go home with a mini masterpiece for only £35. Sounds good to me ... Over 2,000 postcards have been donated by world renowned artists and designers such as Damien Hirst, Grayson Perry, Julian Opie, Tracey Emin, Sir Peter Blake, Manolo Blahnik, film director Ken Loach, fashion designer Hussein Chalayan, Bill Viola, Mario Testino, Wallace & Gromit creator Nick Park, design guru Sir Terence Conran, Richard Billingham, and David Shrigley. However, will you be able to guess which ones they are? The key to the sale is that the identity of the artist remains unknown until the piece of work is bought and the signature is revealed on the back. Viewing Days: 19-25 November, 10am-6pm daily (23 November: late night opening until 8pm) Sale Days: 26 November, 8am-8pm and 27 November, 10am-6pm Location: Royal College of Art, Kensington Gore, London SW7 2EU Tube: South Kensington/High Street Kensington Buses: 9, 10, 52 More here ...