The Museum of Modern Art, MoMA Highlights, New York: The Museum of Modern Art, revised 2004, originally published 1999, p. 270
Smithson's three mirrors in a corner create a structure both lucid and elusive: as each mirror reflects the space around it, it multiplies the reflections in the other mirrors, creating an image with the symmetry of a crystal. Mirrors appear often in Smithson's art, as do fragments of the natural world—here, there are pieces of coral piled in the angle where the mirrors meet. Smithson also combined mirrors with heaps of sand, gravel, and other rocks, matching nature's brute rubble with its precise visual twin. (The delicacy of the lacy pink coral is unusual in his work.)
One of the earthworks artists of the 1960s and 1970s, in other pieces smithson manipulated the natural landscape, sometimes simply and temporarily, through mirrors, sometimes drastically, with a bulldozer. Corner Mirror with Coral relates to his "Non-Sites," indoor works containing substances from an outdoor site elsewhere. Both cerebral and powerfully material, his art shows a fascination with entropy, the tendency of all structures and energies to lose their integrity. In this work a perfect form—the mirrors make three sides of a cube—is made illogical and illusory, for the coral seems to float in midair.