American Indian by Edward S. Curtis and Camera Work; surrealist photography created primarily between the two world wars; and Cleveland-specific subject matter produced by regional and national photographers". Decorative Art and Design An internationally renowned collection, the Decorative Art and Design collection "consists of useful objects in which the form and decoration are the primary focus, not objects intended purely as sculpture" Ingalls Library In addition to its comprehensive collection of fine art, the Cleveland Museum of Art is also home to the Ingalls Library, one of the largest art libraries in the United States. As part of the initial 1913 plan by the museum's founders, a library of 10,000 volumes was to be assembled, to include photographs and archival works. By the 1950s, the collection of books alone had surpassed 37,000 and the photographic collection neared 47,000. By the 21st century, the library had more than 500,000 volumes (and 500,000 digitized slides); renovation of the library space was one of the focal points in the museum's $350 million expansion. ARTLENS Gallery The ARTLENS Gallery is a series of interactive displays and a mobile app that allow visitors to view and interact with the museum's digitized collection. ARTLENS is divided into four components: The ArtLens Wall is a 40-foot display that lets visitors browse and scale all works that are displayed in the museum, as well as some artworks that are not. The wall rotates through artworks in groups organized by criteria such as type, shape, and color. The ArtLens Exhibition is a rotating selection of artworks that are showcased through digital gesture-based games and activities. Examples of these activities are automatically matching the shape of a user's hand gestures to an artwork, or having the user imitate poses found in various works, which are then scored for accuracy. The ArtLens Studio is a series of digital studios for visitors to make their own artwork, such as creating digital pottery by mimicking a potter's movements, or creating collages from images provided by the museum. The ArtLens mobile application provides information about the museum and lists of all its artworks. The app is able to communicate via Bluetooth to beacons located throughout the museum to determine the user's location, and allows the user to mark and save artworks they come across. The app connects to the previously mentioned ArtLens Exhibition and Wall. Following the launch of ARTLENS, the Cleveland Museum of