A craftsman displays the ancient paper making process which Cai Lun invented 1,900 years ago, in Cai Lun Paper Culture Museum in Longting Town, northwest China's Shaanxi Province, May 23, 2011. (Xinhua/Li Yibo)
Tourists churn pulp, which is one step of the ancient paper making process invented by Cai Lun 1,900 years ago, in Cai Lun Paper Culture Museum in Longting Town, northwest China's Shaanxi Province, May 23, 2011. (Xinhua/Li Yibo)
A craftsman dries a piece of paper, which is one step of the ancient paper making process invented by Cai Lun 1,900 years ago, in Cai Lun Paper Culture Museum in Longting Town, northwest China's Shaanxi Province, May 23, 2011. (Xinhua/Li Yibo)
A tourist pounds raw materials, which is one step of the ancient paper making process invented by Cai Lun 1,900 years ago, in Cai Lun Paper Culture Museum in Longting Town, northwest China's Shaanxi Province, May 23, 2011. (Xinhua/Li Yibo)
A craftsman displays the ancient paper making process which Cai Lun invented 1,900 years ago, in Cai Lun Paper Culture Museum in Longting Town, northwest China's Shaanxi Province, May 23, 2011. (Xinhua/Li Yibo)
