Over the last fifteen years, architect Cesar Pelli has collaborated with painters and sculptors on at least three distinct projects. From 1970 to 1973, as architect of the Commons and Courthouse Center in Columbus, Indiana, Pelli worked with Swiss sculptor Jean Tinguely. In 1981, for the New York Architectural League's centennial exhibition, Collaboration: Artists and Architecture Pelli joined painter William Bailey. Currently, as the design architect of the World Financial Center of Battery Park City in lower Manhattan, he is working with artist Scott Burton and Siah Armajani in designing a three and a half acre public plaza on the Hudson River. The nature and results of these professional associations have varied substantially from one project to the next. Pelli shared the following observations and comments with Nancy Rosen in a recent discussion of how these projects evolved. (p. 29)