Foreign visitors watch the photo works on show at the First Impression on Tibet Photography Exhibition, which was opened at the National Center for the Performing Arts in Beijing on Oct. 15, 2012. [Photo/China Tibet Online]

A foreign visitor takes pictures at the First Impression on Tibet Photography Exhibition, which was opened at the National Center for the Performing Arts in Beijing on Oct. 15, 2012. [Photo/China Tibet Online]

A Chinese explains a photo work to a foreign visitor at the First Impression on Tibet Photography Exhibition, which was opened at the National Center for the Performing Arts in Beijing on Oct. 15, 2012. [Photo/China Tibet Online]

Foreign visitors watch the photo works at the First Impression on Tibet Photography Exhibition, which was opened at the National Center for the Performing Arts in Beijing on Oct. 15, 2012. [Photo/China Tibet Online]

A foreign visitor takes a picture at the First Impression on Tibet Photography Exhibition, which was opened at the National Center for the Performing Arts in Beijing on Oct. 15, 2012. [Photo/China Tibet Online]

A foreign visitor takes a picture at the First Impression on Tibet Photography Exhibition, which was opened at the National Center for the Performing Arts in Beijing on Oct. 15, 2012. [Photo/China Tibet Online]

A foreign visitor writes down her wishes at the First Impression on Tibet Photography Exhibition, which was opened at the National Center for the Performing Arts in Beijing on Oct. 15, 2012. [Photo/China Tibet Online]