In 2004, after having worked together in Berlin, Doug Aitken and Klaus Biesenbach co-curated "Hard Light", a group exhibition at MoMA PS1. In the winter of 2007, Aitken's large-scale installation "Sleepwalkers", curated by Klaus Biesenbach in collaboration with "Creative Time", was presented at the Museum of Modern Art in New York. The project included actors such as Donald Sutherland and Tilda Swinton, as well as musicians Seu Jorge and Cat Power. Five interlocking vignettes shown through eight projections were displayed upon the exterior walls of the museum so as to be visible from the street. Concurrent with the exhibition, Aitken also presented a "happening" inside the museum that featured live drummers and auctioneers, and a performance by Cat Power. In the same year, he created an interactive music table: "k-n-o-c-k-o-u-t".