Mark Rothko, Untitled, 1969, John and Mary Pappajohn, Des Moines, Iowa

In a series of brown or black and gray paintings produced from 1969-1970, Rothko divided the composition horizontally and framed the image with a white margin (created by masking the edges of the paper or canvas with tape that was later removed to expose the bare support). The serene dark zone stands out against the turbulent brushwork of the gray section, an area further modulated by the addition of ochre or blue. The sharply defined edge establishes a complex interplay between the work and the viewer, who is drawn into the painting by its sensuous surface, yet kept at a distance by the stark framing device.