Issue edited by Philip Leider. Essay "Incidents of Mirror-Travel in the Yucatan," by Robert Smithson; "Slow Information: Richard Serra," by Robert Pincus-Witten; "On 'Manet's Sources'", by Theodore Reff; "Real Time Systems," by Jack Burnham. Reviews by Emily Wasserman, Robert Pincus-Witten, Terry Fenton, Thomas H. Garver, Whitney Halstead, Palmer D. French, Manny Farber. Cover: Robert Smithson.