Robert Indiana: . . . 4 is not a happy number. 4 is a dangerous number. My fourth American Dream was a danger painting. “Beware; beware. Danger.”
Arthur Carr: Who says that 4 is dangerous? Is this in your experience?
Indiana: Well, this is an old—
Indiana: Superstition. 4 is not a lucky number. Therefore it’s yellow; it’s a yellow 4. And yellow is, of, of course, it’s also gold. Still yellow is a color which suggests difficulties.
Arthur C. Carr, “The Reminiscences of Robert Indiana,” New York, November 1965, Arthur C. Carr papers; Rare Book and Manuscript Library, Columbia University Library.