Installation art is site-specific and usually consists of an ensemble of objects or effects that work together to create a whole. Artists deal with their own thematic concerns and consistently string certain elements throughout their installations. Judy Pfaff installs thousands of disposable items over the surface of a space in order to evoke the feeling of an underwater garden or some other dreamlike fantasy world; Daniel Buren applies stripes to architectural structures as a comment on the physical or social character of the site; and Donald Lipski gathers together hundreds of manufactured objects to create witty, three-dimensional variations on all-over painting.