Lygia Pape, Book of Creation, 1959–60, Artist's book with sixteen unbound pages, some with goauche on board, paper, and string, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38590

Lygia Pape, [Untitled], 1959, Pen and black ink on cream Japanese paper, Art Institute of Chicago, Chicago. https://dartabase.art/cite/aic/237016