Lucio Fontana, Spatial Concept (Concetto spaziale), 1957, Ink and pencil on paper on canvas, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37812

Lucio Fontana, [Untitled], 1956, Ink on incised paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37632