Conceptual art emerged in the 1960s and 1970s as a reaction against the commercialization of the art world and the focus on the art object itself. Instead of creating physical artworks, conceptual artists focused on the concept or idea behind the work, often using everyday objects and materials to convey their message. Artists like Sol LeWitt, Joseph Kosuth, and Yoko Ono pushed the boundaries of art by creating works that were ephemeral, immaterial, or even invisible. Staged photography, on the other hand, is a form of photography where the artist carefully constructs a scene or narrative to convey a particular idea or emotion.