The Berlin Cathedral organ is the largest organ from the late romantic period still preserved in its original state. It is the work of the court organ builder Wilhelm Sauer from Frankfurt / Oder. At its inauguration in 1905 the organ with its 7,269 pipes and 113 stops was considered the largest in Germany. It was designed at the same time as the Berlin Cathedral and has an exceptionally high-quality sound. The lighting of the organ takes into account the functional needs of the organist and the cantor after a good illumination of the gallery and the organ table. The lighting design was calculated with the help of computer models in order to precisely predict the effects of light and shadow. The interplay of different lighting components to create a series of individual lighting scenes allows the organ and gallery to be used optimally for each event and to be experienced visually.