In 1928, regarding photography, László Moholy-Nagy noted that "a small quantity of white is capable of keeping in balance by its activity large areas of the deepest black. . . .” A majority of the 190 photographic works by Ray K. Metzker in this retrospective exhibition, “Unknown Territory,” call to mind—so calculated are their extreme tonal contrasts—this principle of optical design. For example, in Europe: Frankfurt, Germany, 1961, the graphic legacy of Moholy and the Bauhaus (via the Institute of Design , Chicago) are emblematically present. From above—Moholy’s “bird’s eye view”—we are shown