solar atmosphere soon became the primary subject of research at the Einstein Tower. The red shift could be proved only in the 1950s after it became possible to precisely analyze the complex disturbances of the solar atmosphere. Present work The characteristics and behavior of magnetic fields provide the key to understanding solar activity and are at the focus of work at the Einstein Tower. The solar magnetic field can be measured with the help of a double spectrograph and two photoelectric polarization analyzers. Measurements in the photosphere, the visible light realm, permit conclusions about the situation at higher altitude levels. The Potsdam astronomers participate in the operation of an observatory on Tenerife. Instruments to be used there are first developed and tested at the Einstein Tower. The Einstein Tower also plays an important role in training students. Main sights Einstein Sculpture In the tower’s entrance area there is a bronze bust of Einstein which was originally located in one of the rooms of the observatory. After the Nazis' anti-Semitic dictatorship began in 1933, the Einstein Tower lost its name and status as an independent institute. Pictures of Einstein were removed and sculptures were supposedly melted down. However, after 1945 it was discovered that staff members had rescued the portrait bust now to be seen at the base of the tower by hiding it behind crates in the spectrograph lab. As a hidden homage to Einstein a single stone (German: 'ein Stein') was placed where the bust had stood, a tradition that is still kept (the stone is regularly stolen or moved and has to be replaced). The 3 SEC Bronze Brain A few meters in front of the stairs to the Einstein Tower and set into the pavement of the forecourt is a fist-sized art object, a bronze reproduction of a human brain highly reduced in size, its shiny surface a sign of wear, inscribed with the four characters, 3 SEC. It was created by the Berlin artist Volker März, who placed it here and in an identical form in front of the Neurological Institute of the Charité in Berlin. The small sculpture refers to a scientific thesis of Ernst Pöppel according to which "the experience of continuity is based on an illusion. Continuity arises through the networking of contents, which in each case are represented in a time window of three seconds. We reconstruct temporal continuity based on what