pieces. Irwin wanted them to be circular in order to avoid the corners a square or rectangle would produce. But instead of being flat it needed to be convex to deemphasize the edge. The disc was painted where the disc bulges out (point closest to the viewer) the same color as the wall (point furthest away from the viewer) to give it a floating effect. But the combination of convexity and color made it so the viewer had a difficult time determining whether the disc was convex, concave, or flat. (Originally he painted the discs with dots, but the way they turned out was unsatisfactory. He resorted to a spray painting technique, which allowed for the effect that minimized the visibility of the edge.) The discs vary in size, but very little. (Examples of diameters: 60 3/8", 54 1/4”, 54”) They stretch out about 20 inches away from the wall. The lighting needed for the pieces is very specific: “even, ambient, natural daylight, without any artificial supplementation.” But this lighting isn’t easy to obtain in every location, so although there are places that natural light can be used the most common light used is artificial. The artificial lighting consists of two lights on the floor and two lights on the ceiling that beam onto the disc. The shadows created by the disc are projected onto the wall to look like a “rosette of shadow.” At first, an Incandescent light bulb was used, but the yellow it produced was too warm for such a cool color of paint. Irwin moved onto Westinghouse, which was worse than the standard incandescent (in terms of yellowness). He settled on the next bulb, Sylvania, which still produced a small amount of yellow. To solve the problem, a pale blue transparent filter was attached to the bulb resulting in a cool stream of light. Towards Irwin’s last years of working with the discs he reintroduced the line into his work. He sliced a thin three-inch wide line through the middle of the discs to add a pop of color (the gray wall) and disrupt the minimalism. Critical Acclaim “Shown correctly, Irwin’s discs are otherworldly. They seem to float ambiguously. It is the disc seeming to dematerialize or the shadows taking on volume? There is an eerie, fluid sense of density, object and shadow playing in and out of co presence. White becoming color becoming shadow of