CHINA. Shanghai. A Chinese vendor throws a venting ball onto the ground in front of a banner for the World Expo 2010 with the China Pavilion on the Nanjing Road shopping street in Shanghai, China, 28 March 2010. The venting ball is used to release stress of throwers. The ball, in different shapes, is deformed by pressure after it is throwed hard onto the ground but it will recover soon for the next throw.