Piet Mondrian, Red Amaryllis with Blue Background, c. 1907, Watercolor on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38743

Piet Mondrian, Amstel River, 1907, Watercolor and charcoal on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36627

Piet Mondrian, Chrysanthemum (recto) and Head in Profile (verso), 1906, Charcoal on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34486

Karl Wilhelm Diefenbach, Du sollst nicht töten, 1902, Öl auf Leinwand, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/102642

Piet Mondrian, Landzicht Farm: Compositional Study, c. 1905, Fabricated charcoal on blue laid paper, Art Institute of Chicago, Chicago. https://dartabase.art/cite/aic/88464