Cardboards and bricks are pressed against a mural done with gunpowder as Cai Guoqiang, a Chinese artist living in the United States, prepares to create the world's largest gunpowder-blast mural in at museum of Quanzhou, southeast China's Fujian province, May 14, 2006. The 18-meter-long and 9-meter-wide mural depicts a big fig tree and its roots. [Xinhua]