A stone cap that was used to gouge eyes of serfs in a Lhasa prison in old Tibet is on display at an exhibition marking the 50th anniversary of the Democratic Reform in Tibet Autonomous Region in Beijing, Feb. 25, 2009. [Xinhua photo]
![A stone cap that was used to gouge eyes of serfs in a Lhasa prison in old Tibet is on display at an exhibition marking the 50th anniversary of the Democratic Reform in Tibet Autonomous Region in Beijing, Feb. 25, 2009. [Xinhua photo]](http://images.china.cn/attachement/jpg/site1007/20090326/001109b42f730b3529265f.jpg "A stone cap that was used to gouge eyes of serfs in a Lhasa prison in old Tibet is on display at an exhibition marking the 50th anniversary of the Democratic Reform in Tibet Autonomous Region in Beijing, Feb. 25, 2009. [Xinhua photo]")