‘To hold all this together, Rauschenberg’s picture plane had to become a surface to which anything reachable-thinkable would adhere. It had to be whatever a billboard or dashboard is, and everything a projection screen is, with further affinities for anything that is flat and worked over—palimpsest, canceled plate, printer’s proof, trial blank, chart, map, aerial view. Any flat documentary surface that tabulates information is a relevant analogue of his picture plane—radically different from the transparent projection plane with its optical correspondence to man’s visual field. And it seemed at times that Rauschenberg’s work surface stood for the mind itself—dump, reservoir, switching center, abundant with concrete references freely associated as in an internal monologue—the outward symbol of the mind as a running transformer of the external world, constantly ingesting incoming unprocessed data to be mapped in an overcharged field’

Leo Steinberg
The Flatbed Picture Plane
First published in ‘Reflections on the State of Criticism’, in Artforum in March 1972; then in ‘Other Criteria’, 1972, pp.61-98