Visitors look at a "QR code cake" in the automobile Exhibition on May 15, held at the 2014 China (Tanyuan) International Automobile Exhibition in Taiyuan’s coal trading center from May 15 to May 19. The ”QR code cake” exhibited by a company has attracted dozens of guests. Visitors who use a cellphone to scan the QR code on the cake can receive information about the exhibition and also get a piece of cake. (Photo/Xinhua)