In his 1968 essay on "Psychology and Information," George Miller argues that online information-delivery systems can and should respond to the psychologically compelling desire of humans to locate information using spatial features and cues. This commentary draws on subsequent practice to critically examine three implications of Miller's claim---the payoff from virtual as well as real online spatial representation, the tough challenge of scaling up spatial schemes as information density rises, and the danger of using oversimplified assumptions about discourse structure to plan online spatial delivery tools.
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