it had closed for the night, showcased an interest in architectural structures and in art that interacts with urban environments. In 2001, Aitken's exhibition at London's Serpentine Gallery used the entire building for the complex installation New Ocean including transforming the museum's tower into a functional lighthouse at night. 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". In 2008, Aitken produced another large scale outdoor film installation, titled Migration for the 55th Carnegie International show titled "Life on Mars" in Pittsburgh, PA. The first installment in a three-part trilogy entitled Empire, the work features migratory wild animals of North America as they pass through and curiously inhabit empty and desolate hotel rooms. Continuing Aitken's work in large scale outdoor video installation, his artwork "SONG 1" (2012), created for the Hirshhorn Museum and Sculpture Garden, challenged the standard of public art in Washington D.C. The artwork, which deconstructed the popular song "I Only Have Eyes for You", created a 360 degree screen out of the circular facade of the museum. Rather than using a more typical concave surface for such a projection, Aitken projected the film onto the convex exterior of the museum creating a cinema experience that required moving around the building and could never be fully seen from any one location. Another example of what the artist has called 'liquid architecture', his freestanding installation ALTERED EARTH (2012) explores the Camargue region of southern France in a maze-like flowing arrangement of twelve large projections in the hangar-like Grande Halle of the Parc des Ateliers in Arles. The work also inspired an app created by the artist and POST for the Apple iPad. Commissioned by art patron Bagley Wright,