This argument additionally ties in with the Marxist principle of mystification and elite tradition. Works on paper, such as drawings, pastels, watercolors, prints, and photographs are usually not permanently displayed for reasons of conservation. Instead, public access to these materials is provided by a dedicated print room positioned within the museum. Murals or mosaics typically Art Galery stay where they have been created , though many have additionally been eliminated to galleries. Various types of 20th-century art, similar to land art and efficiency art, also usually exist outdoors a gallery. Photographic records of these sorts of art are sometimes shown in galleries, nonetheless.