Zhou Ziqian shows postcards that display photos he took of people posing with UU, the mascot for the Shenzhen Summer Universiade, in Shenzhen, Guangdong province, on August 14, 2011. Zhou, a Shenzhen resident and a cycling enthusiast, spent 400 days biking around China, collecting 2,011 photos of people posing with UU and promoting the Universiade. [Photo/Xinhua]