Die Mimik der Tethys (The Expressions of Tethys) consists of a buoy floating at high altitude in the center of the iconic helical ramp of the former FIAT factory in Lingotto. Its movement, which evokes that caused by the waves, is achieved through a sophisticated engineering system, which connects Die Mimik der Tethys to a sister buoy located off the Atlantic Ocean. The original buoy continuously transmits motion data via satellite to its double, and the information drives eight electric motors and rope winches, which precisely reproduce, in real time, its motion. The work thus becomes a sort of hypnotic machine, a surreal presence that leads one to imagine that the monumental space of the ramp could contain the ocean waves. The work also seems to stage a legend linked to the architecture of the Lingotto, which due to its mammoth shape and scale was in the past defined as "the transatlantic". The title is inspired by the figure of Thetis, goddess of the sea in Greek mythology, daughter of the sky (Uranus) and the earth (Gaea). The literary inspiration that this personification brings with it recalls a romantic conception of the sea, linked to the aesthetic and emotional experience of humanity faced with the sublime grandeur of nature. Von Bismarck wants us to confront precisely our understanding of the concept of nature, placing emphasis on the fact that it is not an innate conception, but a culturally constructed one. The majestic and indomitable ocean of the romantic tradition clashes with the idea of the sea we know, today at the center of urgent geopolitical issues: the one whose rising is a symptom of the serious contemporary climate crisis, the one where thousands of people lose their lives on the migratory routes . Die Mimik der Tethys is therefore a presence with a strong poetic charge, but also a direct witness of our restless times.