
Benjamin Franklin Drawing Electricity from the Sky, c. 1816.
Benjamin West (American), oil on slate
Philadelphia Museum of Art, United States
57 works by 31 artists
57 works featuring “Key” by 31 artists, from the 15th to the 20th century, held in 34 museums.

Benjamin West (American), oil on slate
Philadelphia Museum of Art, United States

San Pedro Apóstol (museum title)
Le Greco (Spanish), oil on canvas
El Greco Museum, Spain

Johann Heinrich Füssli (Swiss), oil on canvas
Los Angeles County Museum of Art, United States

San Pedro (museum title)
Jusepe de Ribera (Spanish), oil on canvas
Prado Museum, Spain

Las lágrimas de San Pedro (El Greco, obras originales) (museum title)
Le Greco (Spanish), oil on canvas
Phillips Collection, United States

Gustav Vasas intåg i Stockholm 1523 (museum title)
Carl Larsson (Swedish), oil on canvas
Nationalmuseum, Sweden

Les Apôtres Pierre et Paul (museum title)
Le Greco (Spanish), oil on canvas
Hermitage Museum, Russia

Las lágrimas San Pedro o San Pedro en lágrimas (museum title)
Le Greco (Spanish), oil on canvas
El Greco Museum, Spain

Scene udenfor en konsumtionsbod (museum title)
Wilhelm Marstrand (Danish), etching
Statens Museum for Kunst, Denmark

Der Tod als ungebetener Gast. 1844: Plusquamperfectum (museum title)
Adolph Menzel (German), watercolor and gouache on cardboard
Kupferstichkabinett Berlin, Germany

Fernand Léger (French), oil on canvas
Art Institute of Chicago, United States

Die Sünde, vom Tode verfolgt (museum title)
Johann Heinrich Füssli (Swiss), oil on canvas
Kunsthaus Zürich, Switzerland

Benjamin West (American), oil on canvas
Royal Collection, United Kingdom

Großes Stillleben mit Fernrohr (museum title)
Max Beckmann (German), oil on canvas
Pinakothek der Moderne, Munich, Germany

Apóstol Pedro y Pablo (museum title)
Le Greco (Spanish), oil on canvas
Nationalmuseum, Sweden

Jusepe de Ribera (Spanish), etching and engraving on laid paper
National Gallery of Art, United States

Albrecht Dürer (German), engraving on laid paper
Museum of Fine Arts, Budapest, Hungary

L'Enterrement du comte d'Orgaz (museum title)
Le Greco (Spanish), oil on canvas
Church of Santo Tomé, Spain

"To him the mighty mother did unveil Her awful face..."… (museum title)
William Blake (British), watercolor, pen and black ink over graphite, with inlaid letterpress page
Yale Center for British Art, United States

Karikatur af tykmavet mand, gående mand mod venstre, med en… (museum title)
Nicolai Abildgaard (Danish), pencil, pen, brush and grey ink
Statens Museum for Kunst, Denmark

Les vainqueurs de la Bastille devant l'Hôtel de Ville, le… (museum title)
Paul Delaroche (French), oil on canvas
Petit Palais, Musée des Beaux-Arts de la Ville de Paris, France

Fernand Léger (French), oil on canvas
Musée National d'Art Moderne, France

Hieronymus Bosch (Dutch), oil on oak panel
Royal Museums of Fine Arts of Belgium

Maria Pardos (Brazilian)
Museu Mariano Procópio, Brazil

William Hogarth (British), etching, engraving
Yale Center for British Art, United States

Portrait du comte-duc d'Olivares (museum title)
Diego Velázquez (Spanish), oil on canvas
São Paulo Museum of Art, Brazil

L'Ordre (museum title)
Nicolas Poussin (French), oil on canvas
Kimbell Art Museum, United States

Antoine van Dyck (Belgian), oil on canvas
Kunsthistorisches Museum, Vienna, Austria

Invocation au Pair éternel (museum title)
Grandville (French), hand-colored lithograph
Musée Carnavalet, France

Albrecht Dürer (German), woodblock print
National Gallery of Art, United States

La rendición de Granada (museum title)
Francisco Pradilla (Spanish), oil on canvas
Senate of Spain

La Lamentation sur le Christ mort (museum title)
Sandro Botticelli (Italian)
Bavarian State Painting Collections, Germany

La Reddition de Bréda (museum title)
Diego Velázquez (Spanish), oil on canvas
Prado Museum, Spain

San Pedro (museum title)
Jusepe de Ribera (Spanish), oil on canvas
Prado Museum, Spain

Le Sacrement d'ordination (museum title)
Nicolas Poussin (French), oil on canvas
National Galleries of Scotland, United Kingdom

Jusepe de Ribera (Spanish), oil on canvas
Metropolitan Museum of Art, United States

Albrecht Dürer (German), engraving on laid paper
National Gallery of Art, United States

Antoine van Dyck (Belgian), oil on canvas
Kunsthistorisches Museum, Vienna, Austria

Jean-Honoré Fragonard (French), black chalk on cream laid paper, laid down on cream laid card
Art Institute of Chicago, United States

Antoine van Dyck (Belgian), oil on wood
Hermitage Museum, Russia

Allegori över konung Karl XI:s och drottning Ulrika… (museum title)
David Klöcker Ehrenstrahl (Swedish), oil on canvas
Nationalmuseum, Sweden

Fernand Léger (French), oil on canvas
Musée National d'Art Moderne, France

Pierre Paul Rubens (Belgian), oil on oak wood
The Wallace Collection, United Kingdom

Madonna and Child Enthroned with Saints (museum title)
Raphaël (Italian), oil and gold on wood
Metropolitan Museum of Art, United States

Jusepe de Ribera (Spanish), oil on canvas
Art Institute of Chicago, United States

Albrecht Dürer (German)
Pinacothèque Ambrosienne, Italy

Frederik I udløser Sten Strures enke og sønner af fængslet… (museum title)
C.W. Eckersberg (Danish), drawing
Statens Museum for Kunst, Denmark

Et køkkenbord (museum title)
Carl Bloch (Danish), oil on canvas
Statens Museum for Kunst, Denmark

Der Tod als ungebetener Gast. 1844: Perfectum; 1845… (museum title)
Adolph Menzel (German), watercolor and gouache on cardboard
Kupferstichkabinett Berlin, Germany

Antoine van Dyck (Belgian), oil on wood
Dresden State Art Collections, Germany