Carl-Wolfgang Holzapfel has returned to the former secret Stasi Berlin jail, Hohenschoenhausen, to relive his 1960s incarceration.
He has voluntarily locked himself up in a cell for one week, a webcam will provide live streaming of the event.
Mr Holzapfel says that "with this art project, we want to show the role the Resistance played in bringing down the Wall." Steve Rosenberg reports.
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