 Also in the 1990s, Halley started to produce site-specific installations for museums, galleries, and public spaces that would interact with the surrounding architecture.His installations mix imagery and media such as painting, fiberglass relief sculpture, wall-size flowcharts, and digitally generated wallpaper.Halley created his first site-specific installation at the Dallas Museum of Art; this installation included paintings, silkscreen prints, wallpaper, and murals of flow charts and other images.