The two portfolios “Natural History” count among the most important works of the mid 1970s. Cy Twombly made them at the height of his epoch in pseudo-scientific aesthetics. The first series “Natural History Part I” is about fungi. In the expressive collage prints the clarity of schematic drawings and photographs is in a wonderful contrast with Twombly’s expressive graphic duct. These innovative sheets unite logic and chaos, science and delusion and become allegories of mental structures and the human quest for knowledge.