František Kupka, Girl with a Ball, c. 1908, Pastel on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37352

Ottilie W. Roederstein, Bildnis des Malers Jakob Nussbaum, 1909, Öl auf Leinwand, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/2977

Ferdinand Hodler, Bezauberter Knabe, um 1909, Öl auf Leinwand, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/2061

František Kupka, Bather, (1906), Pastel and charcoal on gray paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/37271

Ferdinand Hodler, Figure (Study for die Empfindung), (1902–03), Pencil and ink on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34876

Ferdinand Hodler, Genfer See mit den Savoyer Alpen, 1907–1911, Öl auf Leinwand, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/4089

Augusto Giacometti, Color Abstraction, 1903, Pastel on paper mounted on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36786

František Kupka, View from a Carriage Window, c. 1901, Gouache and watercolor on paper with cardboard overlay, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34108

Félix Vallotton, Jura-Landschaft bei Romanel, 1900, Öl auf Malpappe, Städel Museum, Frankfurt am Main. https://dartabase.art/cite/staedel/4057

František Kupka, Prometheus, (1909), Gouache, watercolor, ink, and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36018