Ten years ago, Sanne van Heijst was working on developing teaching materials at the museum of Konzentrationslager Herzogenbusch, or Vught, a former concentration camp in the Netherlands. Van Heijst was looking for a way to get through to the students who would visit the museum.

“I was looking for a common thread that would help pupils to make a connection between the different groups of prisoners from the camp and the different events that happened,” she said.