Reverse glass art characterizes the Staffelsee region. It is an inseparable part of regional and international art history, not least thanks to Gabriele Münter, Wassily Kandinsky and Franz Marc, who were so enthusiastic about this art that they painted reverse glass paintings themselves. Since it opened in 1993, the Murnau Castle Museum's reverse glass art collection has grown steadily. Over the past 20 years, more than 1,200 pictures from European and non-European reverse glass painting centers have been added to the museum's collection. The concept of the new reverse glass art room, which was re-equipped in 2013 as part of the museum's renovation work, is geared towards constant change. The hangings are changed on a regular basis within the various sequences. New acquisitions, restored works and research results can thus be presented in different contexts. Due to the cross-border collection of Udo and Hedi Dammert, which was anchored in the permanent exhibition from the very beginning, the focus in the following years was always on a broad collection policy. Only in a supra-regional comparison can the traditional reverse glass painting of the Staffelsee region be classified in art history. In 2007, the museum received Wilhelm Gartner's collection of 420 reverse glass paintings with an international focus, which supplemented and expanded the museum collection. The folk art created in Murnau and the surrounding area at the beginning of the 20th century by Gabriele Münter, Wassily Kandinsky and Franz Marc was particularly valued. Their fascination with the themes and techniques of reverse glass painting had a significant influence on the development of expressionist art in Germany. For the artists in the circle of the "Blue Rider" and for collectors such as Udo Dammert and Wilhelm Gartner, the coexistence and coexistence of art and folk art, their origins and their artistic reception were in the foreground. Looking back, Gabriele Münter noted on February 10, 1933: "Kandinsky and I were in Tyrol (I think in the spring of 1907) and saw beautiful painted shrines there - old folk art. But it seems to me that we first got to know glass paintings here in Murnau. It must have been Jawlensky who first drew attention to Rambold and the Krötz collection. We were all enthusiastic about the things [...]". Heinrich Rambold learned reverse glass painting around 1900 at the age of 13 and Gabriele Münter, Wassily Kandinsky and Alexej Jawlensky were able to look over his shoulder as he painted in his workshop. Gabriele Münter in particular is known to have made copies of Rambold's paintings: "With Rambold I saw how it can be done. As far as I know, I was the first in Murnau to take panes of glass and make something. First copies, then various things of my own [...] I was delighted by the technique and how beautifully it worked [...]". In 1911, Kandinsky and Franz Marc selected six reverse glass paintings from the Staffelsee region for the almanac "Der Blaue Reiter". They came from the collection of over 1000 paintings by the Murnau brewmaster Johann Krötz, which is now in the Oberammergau Museum. On June 8, 1911, Kandinsky wrote to Franz Marc from Murnau: "We are still here and are enjoying the beautiful weather with its thunderstorm atmosphere [...] and also glass painting. All three of us (including our housekeeper) are painting glass paintings. I really don't know of any more beautiful work. Unfortunately, the stuff is just so fragile".