Dan Graham's artworks are said to blur the line between sculpture and architecture. Since the 1980s, Graham has been working on an ongoing series of freestanding, sculptural objects called pavilions. Graham's popularity has grown since he started his walk-in pavilions and he has received commissions all over the world. His pavilions are steel and glass sculptures which create a different space which disorients the viewer from his or her usual surroundings or knowledge of space. They are made of a few huge panes of glass or mirror, or of half-mirrored glass that is both reflective and transparent. Wooden lattice and steel are other materials most commonly used in his work.