These photographs from the estate of Andreas Züst are dealing with the phenomena of seas of fog which are illuminated from below by the lights of our civilisation, and therefore become fluorescent. The book contains the most important aspect of Andreas Züst's “Sky”-series. These photographs were taken on top of the mountain Bachtel in the canton Zurich, Switzerland, in 1999 and 2000, only a few months before Andreas Züst's premature death. Züst has beautifully captured the phenomena of winterly seas of fog that are illuminated from below by street lights, buildings, civilization in general. Swiss author Peter Weber called this “fluorescent seas of fog”. Peter Weber also wrote an additional, poetic and literary text to go with these images. He used to collaborate with Andreas Züst since mid of the 1990s, both chasing after aesthetically impressive, scientifically interesting natural phenomena.