Stained glass art, treated as an artistic craft and thus valued lower, remains to this day a phenomenon as fascinating as it is difficult to grasp since it only comes alive when light penetrates it. So let's throw a beam of light on the stained glass phenomenon: What skills did stained-glass makers have? How to "read" stained-glass? What was their place in the art panorama of the given era? These are the questions that the creators of the exhibition pose in the first part of the exhibition. The second part of the exhibition is devoted to the history of re-discovering stained-glass windows in the 19th century.