This art history video discussion looks at Paul Klee's "Twittering Machine (Die Zwitscher-Maschine)", 1922, watercolor, ink, and gouache on paper (MoMA).

This art history video discussion examines Gustav Klimt's "Death and Life", 1910, reworked 1915, oil on canvas, 178 x 198 cm (Leopold Museum, Vienna).

This art history video discussion examines Fitz Henry Lane's "Owl's Head", Penobscot Bay, Maine, 1862, oil on canvas, (Museum of Fine Arts, Boston).

This art history video discussion looks at the "Last Judgment Tympanum", Central Portal on West facade of the Cathedral of St. Lazare, Autun, c. 1130-46.

This art history video discussion looks at Laszlo Moholy-Nagy's "Composition A.XX", 1924, oil on canvas, 135.5 x 115cm (Musee national d'art moderne, Centre Georges Pompidou, Paris).

This art history video discussion examines Sir Frederic Leighton's "An Athlete Wrestling with a Python", 1877, bronze, 1746 x 984 x 1099 mm (Tate Britain, London).

This art history video discussion examines Leonardo da Vinci's "Adoration of the Magi", 1481, oil on panel (Galleria degli Uffizi, Florence).

In this video and accompanying essay, Dr. David Drogin discusses Leonardo da Vinci and his Letter to the Duke of Milan.

This art history video discussion examines Leonardo da Vinci's, Last Supper, oil, tempera, fresco, 1495-98 (Santa Maria delle Grazie, Milan).

This art history video presents a conversation between Salman Khan and Beth Harris about Leonardo da Vinci's "Mona Lisa" (c. 1503-1505, oil on panel) and its changing meaning. (Musée du Louvre).

This art history video discussion examines Leonardo da Vinci's "The Virgin and Child with St Anne and St John the Baptist" (Burlington House Cartoon), 1499-1500, charcoal and chalk on paper, c. 1499-1500 (National Gallery, London).

This art history video discussion examines Leonardo da Vinci's The Virgin of the Rocks, c. 1491-1508, oil on panel, National Gallery (London).

This art history video discussion examines Roy Lichtenstein's "Rouen Cathedral Set V", 1969, oil and magna on canvas, 3 canvases (SFMOMA).

This art history video discussion provides an introduction to Filippo Brunelleschi's experiment regarding linear perspective, c. 1420, in front of the Baptistry in Florence.

This art history video discussion examines Fra Fillippo Lippi's "Portrait of a Man and Woman at a Casement", tempera on wood, c. 1440 (Metropolitan Museum of Art).

This art history video lesson looks at Sir John Everett Millais' "Ophelia", 1851-52, oil on canvas (Tate Britain, London); and Barnett B. Newman's "Vir Heroicus Sublimis", oil on canvas, 1950-51 (MoMA).

This art history video lecture examines Ambrogio Lorenzetti's "Presentation of Jesus in the Temple", 1342, tempera on panel, (Galleria degli Uffizi, Florence).

This art history video discussion examines Lucas Cranach the Elder's "Judith with the Head of Holofernes", c. 1530, oil on panel (Kunsthistorisches Museum, Vienna).

This art history video discussion examines Lucas Cranach the Elder's "Cupid complaining to Venus", c. 1525, oil on wood (The National Gallery, London).

This art history video discussion examines Lucian Freud's "Standing by the Rags" 1988-89, oil on canvas (Tate Britain, London).