The detached hexagonal building has been part of the Swiss Museum of Transport complex since 1979. The exhibition it houses documents the oeuvre and craftsmanship of the artist Hans Erni (1909-2015) and provides insights into a unique body of work and a life engaged with contemporary historical, cultural, technical and ecological themes. Aside from the painting table for children, the museum with its auditorium is also a popular event venue. The striking panta rhei mural creates a unique atmosphere. On the ground floor, Hans Erni encounters the pioneer of automotive streamlining, aerodynamics engineer Paul Jaray.