Glowing Core ("Glutkern"). An installation by Rebecca Horn.
In the center of the church, three golden funnels are hung from under the dome of the cathedral, which are reflected in a moving mirror lying on the floor. Above this, circular canvases with different averages are erected on three levels. The blue of the sky shines under the dome and there is a feeling of 20 meters deep opening under the floor level, creates a view into the "glowing core".