On the first floor of the Hans Erni Museum, abstract paintings by Hans Erni are juxtaposed with three "Tatra" cars designed by Paul Jaray. They embody the artistic and technical avant-garde of the 1930s. Paul Jaray and Hans Erni were neighbors in Lucerne for a time and maintained a lively exchange. Erni actively supported Jaray in his experiments on the lake as a "test pilot".

At the time of his acquaintance with Paul Jaray, the young Hans Erni was creating abstract paintings with a dynamic character. The compositions of that time simultaneously convey the impression of static and floating, calm and speed. In many of his works, the intentions and studies of the streamline pioneer and the formal elements and lines of the artist come very close.