František Kupka, [Untitled], 1928, Gouache, watercolor, and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38252

Jannis Kounellis, [Untitled], 1960, Polyvinyl acetate paint and tempera on canvas, Tate, London. https://dartabase.art/cite/tate/AR00614

Jannis Kounellis, [Untitled], 1977, Synthetic polymer paint, tallow, and adhesive tape on colored paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/36938

El Greco, Saint Ildefonso, c. 1603/1614, oil on canvas, National Gallery of Art, Washington. https://dartabase.art/cite/nga/90

František Kupka, Admiration, c. 1899, Gouache, charcoal, watercolor, crayon, and pastel on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/33684

El Greco, The Holy Family with Mary Magdalen, c. 1590–95, oil on canvas, Cleveland Museum of Art, Cleveland. https://dartabase.art/cite/cleveland/108541

Jannis Kounellis, Untitled (7 x 33), 1959, Tempera and glue on graph paper on canvas, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34584

El Greco (Domenikos Theotokopoulos), Christ Driving the Money Changers from the Temple, c. 1570–75, Oil on canvas, Minneapolis Institute of Art, Minneapolis. https://dartabase.art/cite/mia/24.1

František Kupka, Replica of Fugue in Two Colors: Amorpha, 1912, (1946), Gouache, ink, and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34761

Jannis Kounellis, [Untitled], 1971, Oil paint on canvas, Tate, London. https://dartabase.art/cite/tate/AR00497

El Greco, Saint Martin and the Beggar, 1597/1599, oil on canvas, National Gallery of Art, Washington. https://dartabase.art/cite/nga/1164

František Kupka, Replica (1946) of Vertical Planes, (1946), Watercolor, gouache, and pencil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/34788

El Greco, Madonna and Child with Saint Martina and Saint Agnes, 1597/1599, oil on canvas, wooden strip added at bottom, National Gallery of Art, Washington. https://dartabase.art/cite/nga/1165

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

František Kupka, [Untitled], c. 1925–30, Colored pencil, pencil, ink, and oil on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38250

František Kupka, Study with Green, (c. 1912), Chalk and gouache on paper, The Museum of Modern Art, New York. https://dartabase.art/cite/moma/38151

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