Secret auction, Art on a Postcard, is back for its fifth year, featuring some of the most collectable and interesting contemporary artists practicing today, such as Marina Abramović, Humphrey Ocean RA, Golucho, Volker Hueller, Rob and Nick Carter, Martin Yeoman, Minas Halaj, Vanessa Jackson RA, Vhils, Rebecca Salter RA and Maria Kreyn.
