The exhibition “Raimund Kummer. Sublunar Interference” at Hamburger Bahnhof – Museum für Gegenwart – Berlin features four large-scale sculptural works from different stages of Kummer’s oeuvre. The works, made between 1979 and 2017, address the subject of seeing and are exhibited together for the first time. “Any site can be a potential site for art.” Raimund Kummer’s (b. 1954) interventions in urban space since the 1970s, as well as the forms of presentation that he developed, result from an understanding of art that no longer differentiates between the site of the work’s origin and the site where it is made public. Works following up on this – temporary installations, sound, staged photographs, sculptures, photographic and filmic works – can be ascribed to the starting point of Kummer’s work: the Realraum. The title Sublunar Interference is a poetic allusion to the question of light and seeing as possible forms of perception. ‘Interference’ thus constitutes a notion of action that is set within the cosmic by the attribute ‘sublunar’. It denotes art’s infinite sphere of activity and the genre-spanning scope of Raimund Kummer’s oeuvre. Essential to his sculptures are questions derived from an experimental relationship to material and their resolution in practice, not the theoretical discourse of conceptual drafts.