With Kunstmuseen Krefeld's exhibition dialogue Adolf Luther / Julio Le Parc: Interactive Spatial Experiences, two visionary positions met at Ludwig Mies van der Rohe's villas Haus Lange and Haus Esters: Krefeld native Adolf Luther (1912-1990, Krefeld) and French-Argentine artist Julio Le Parc (b. 1928 in Mendoza, Argentina, now living in Paris). Both artists use their installation-based works to break down the boundaries between art and its viewers. The interactivity and experimental character of both artistic approaches express their sociopolitical agendas. The catalog-duo documents all of the works displa yed at these iconic houses. Also contained in the publications are essays that shed new light on Luther and Le Parc, including, among others, one by internationally renowned art historian Serge Lemoine. In addition, writings by both artists, some previously unpublished, usher readers into a deeper understanding of the radical nature of their approaches. This is the first German-language monograph on Julio Le Parc in fifty years.