sentences:  Also in 2001, the foundation received a gift of the large collection of the Bohen Foundation, which, for two decades, commissioned new works of art with an emphasis on film, video, photography and new media.Artists included in the collection are Pierre Huyghe and Sophie Calle.Between September 2005 and July 2008, the Guggenheim Museum underwent a significant exterior restoration to repair cracks and modernize systems and exterior details.