Theo van Doesburg, Study for Composition VIII (The Cow) (recto); Untitled (verso), c. 1917, Gouache, oil, and charcoal on paper (recto and verso), The Museum of Modern Art, New York. https://dartabase.art/cite/moma/35396

Theo van Doesburg, Study for a Composition, 1923, Gouache and ink on tissue paper and pen and ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38206

Jean (Hans) Arp, Mountain, Navel, Anchors, Table, 1925, Gouache on board with cutouts, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33669

Piet Mondrian, Lozenge Composition with Yellow, Black, Blue, Red, and Gray, 1921, Oil on canvas, Art Institute of Chicago, Chicago. https://dartabase.art/cite/aic/109819

Theo van Doesburg, Contra-construction in a Circle, c. 1923, Gouache, ink, and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33496

Theo van Doesburg, Design for a stained-glass window for Christian ULO School, Rehobôth te Drachten, 1922–23, Gouache and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38207

Piet Mondrian, Composition with Red, Yellow, and Blue, 1927, oil on canvas, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/143278