Alberto Giacometti, [Untitled], (1965), Ballpoint pen on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37264

Sonja Sekula, Untitled (Sketchbook), 1961, Spiral-bound notebook with gouache, ink, colored ink, metallic paint, pencil, colored pencil, and ballpoint pen on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34743

Enrique Brinkmann, Procession, 1962, Ink and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33713

Pablo Picasso, The Pool, January 30, 1968, Pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34830

Eduardo Chillida, Around the Void II (Alrededor del vacio II), 1965, Forged steel, Art Institute of Chicago, Chicago. https://dartabase.art/cite/aic/93444

Antonio Saura, Crucifixion, 1960, Collage and ink on black paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33329

Eduardo Chillida, [Untitled], (1966), Ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33342

Antonio López García, The Staircase, 1967, Pencil and wax on paper on board, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34492

Jean Tinguely, Sketch for Homage to New York, 1960, Felt-tip pen and ink on board, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33838

Pablo Picasso, [Untitled], 1969, Ballpoint pen on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35587

Antonio Saura, Señorita, 1960, Gouache and ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37185

Pablo Picasso, Figures, 1967, Ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36254

Pierre Haubensak, Study for Mauresque, 1965, Synthetic polymer paint on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35192

Jean Tinguely, 50 RPM, 1965, Crayon, pencil, felt-tip pen, ballpoint pen and tape on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35860