The US-American Wilson A. Bentley is today considered one of the first atmospheric scientists. His photomicrographs of ice crystals testify to an intensive examination of the physical dimension of observing nature and the impossibility of subject-independent research. As early examples of so-called SciArt, Bentley’s photomicrographs are evidence of a historically close connection between art and science. According to the w/k classification, Bentley’s photomicrographs fall into the category of Art-Related Scientists. While Bentley himself can be described as an aesthetically proceeding meteorologist, his photographs are ambiguous threshold phenomena. They demonstrate the importance of aesthetics in the communication of scientific knowledge.