Artist's book / exhibition catalogue published in conjunction with show held April 16 - May 29, 1977. Catalogue incorporates four vellum overlays of architectural drawings over black-and-white photographs of Robert Irwin's installation designs. Works include Black Plane for Fifth Avenue and 42nd Street; Black Planes - Shadows, Park Avenue; Rectangle - Mercury-Vapor Lamps, Central Park; Line Rectangle, World Trade Center; City Grids. Essay, "Notes Toward a Model," by Robert Irwin based on work in progress "On the Nature of Abstraction." Additional installation images, architectural plans, acknowledgments, checklist, chronology, exhibition history, bibliography by exhibition's curator Richard Marshall.