Robert Indiana kept a series of illustrated journals during the late 1950s and 1960s, in which he discusses the development of his work as well as his daily life on Coenties Slip.

In his journal entry for September 28, 1961, Indiana writes that it was "a day of settling in . . . with everyone very buzy [sic] on [the] Slip" with a new tenant, a Wall Street friend of Ellsworth Kelly, moving into 3-5, and the building's hallway being painted white. He notes that Rolf (Nelson) "did not participate, but did, by telephone, work on my outfit for Monday." Monday was the date of the opening of the Museum of Modern Art's The Art of Assemblage, in which Indiana's Moon was included. Indiana records that the museum called to ask if he was attending the dinner before the opening (his invitation had been lost at the David Anderson Gallery).  

Indiana also notes that gallerist (Allan) Stone, sent by Stephen Durkee, had been down to see James Rosenquist, who was working on windows for Bloomingdale's. He writes that he saw Kelly, who asked him if he was in the assemblage show, and that Jack Youngerman was coming back this weekend. Lastly, Indiana records that he glued his final four canvases, and that Randy (Muhleman) was leaning out of a window. Muhleman and Indiana had once lived together.