Her photograms are a direct record of
atmospheric conditions
during the process of their production: light,
humidity, and the outside temperature, among other factors, determine the surface of the final works.
Another paper discusses how
atmospheric humidity increased
during the recent period of pronounced global warming (from about the late 1970s to the present), with a
humidity decrease
during the cooling / temperature stagnation period of ~ 1940s to the 1970s: