László Moholy-Nagy, who overtook the preliminary course from Johannes Itten in 1923 conentrated in his lectures, among others, in the training of the sense of touch that was examined by his students through so-called tactile boards. Otti Berger's tactile board from 1928 was even published in Moholy-Nagy's publication "Von Material zu Architektur" (1929). Made of different kinds and different colored threads Berger assembled trinagular forms on a metallic panel. By shifting squared cardbord cards underneath these triangles the tactile board can be red bit by bit. The result is "material alphabet" that foreshadows Otti Berger's sensitive handling with textiles that will form part of the rest of her life.
Literature: Ingrid Radewaldt, "Otti Berger", in: Ulrike Müller, Bauhaus Women. Art, Handicraft, Design, Munich 2009; Sigrid Wortmann-Weltge, Bauhaus-Textilien, Kunst und Künstlerinnen der Webwerkstatt, Schaffhausen 1993.