Installation Art
a possible definition

"Installation refers to a dedicated space in which one artistic vision or aura is at work, setting forth various kinds of phenomena. An installation may be defined as anything the artist wants to do when given a room in which to work... In an installation there is unlikely to be a single object, but an assemblage, attached or not. Conversely, an installation may consist of no objects at all but a spatial experience, not unlike an architectural manifestation. Regardless, the viewer is usually in an enclosed space, swept up in a work of art much larger than an individual object can normally create... The artist has created an arrangement that is an integrated, cohesive, carefully contrived whole." - Mark Rosenthal