In 2017, the Deutsches Technikmuseum in Berlin acquired a historic lithographic workshop with a printing press, a wide variety of working materials, and nearly one hundred lithographic stones. Some of these stones have a very special history. They originally belonged to the "Paul Pittius Lithography Print Shop and Luxury Card Plant" in Berlin, whose owners, Martin and Julius Gerson, were persecuted and murdered as Jews under National Socialism. The exhibition tracks the path of the stones back in time, tells the story of the print shop and recalls the fate of the two brothers. It is the result of provenance research at the Deutsches Technikmuseum and was created in conjunction with the families of the former owners.