The full story of what went on in China during the Cultural Revolution may never be known, but one photographer secretly took some 30,000 pictures at the time, and then buried them to keep them safe.
Chinese photographer Li Zhensheng's negatives are the centre piece of a new exhibition at the Barbican, and some of the pictures have never been seen in public before.
He told Zubeida Malik that he "never dreamed of having this show in the west".
He explained that it is not possible at the moment to show these photos in China but that he hopes "this day will come soon".
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