One of the fundamental tasks of a museum is the study of its own holdings. In conjunction with diverse exhibition and research projects, we also explore the meaning, materiality and provenance of the artworks. As an example, an examination of the reverse of Lászlo Moholy-Nag’s ‘Konstruktion’ with ultraviolet light revealed the address stamp of the artist’s live-in studio in Berlin-Schöneberg, which made it possible to draw conclusions about the time and circumstances of the work’s production.