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Robert Irwin believes that the viewer’s perceptions, rather than material objects, define a place. In 1983, for a General Services Administration commission at the Old Post Office in Washington, D.C., Irwin hung forty-eight panels of translucent fabric in rows from the atrium ceiling. Irwin intended the fabric to alter the way the viewer looked at the whole space. He hoped that because the panels appeared and disappeared, depending on the angle of sunlight coming through the skylight, the viewer’s eye would constantly move between the architecture and the fabric, increasing her awareness of the original architectural details of the atrium.