Created especially for St. Nicholas’s Cathedral in Greifswald, Fenster für bewegtes Licht, 2024, invites the ephemeral effects of the weather outside the building into the sanctum, bathing the nineteenth-century interior of the church in the light of the current day. The geometric pattern of the stained-glass window installed in the Gothic eastern windows develops from diamonds and squares at the bottom to large overlapping circles above. The glass panels transition in color from red to yellow to transparent and blue at the top, creating a chromatic fade inspired by the palette of Caspar David Friedrich. The window thus amplifies the outdoor lighting and colours the interior of the building and the altar within it.

Because of the orientation of the church, the windows receive direct sunlight only in the morning, especially during the winter months. A heliostat, or sun-tracking device, installed on the neighboring building redirects sunlight towards the windows in the afternoon, making the changing light and weather conditions visible for longer hours of the day, year-round. The heliostat not only extends the duration of daylight entering the church but also creates additional light effects visible throughout the day on the church walls and inner choir.

As a meditative focal point behind the altar, the artwork encourages pause and reflection – aspects central to both the Romanticism of Caspar David Friedrich and Protestant spirituality.