TOPSHOTS A selection of postcards are pictured during a photocall for the Royal College of Arts (RCA) Secret Postcard sale in London, on March 13, 2013. The RCA's secret postcard sale asks professional artists and designers, in addition to up-and-coming artists to make and donate a piece of work with their signature on the back. All the postcards are displayed anonymously and buyers only discover the identity of the postcards author once they have paid for it. AFP PHOTO / LEON NEAL