Photograph by Francesca Woodman, 1977-1978

Painting by Egon Schiele, 1911

Painting from altarpiece by Robert Campin, c. 1425-1430

Painting by Laszlo Peri, 1920-1921

Detail of painting by Quentin Metsys, 1514

Studio of Étienne and/or Georges de la Tour, c. 1650

Endoscopy still, 2007

Installation by Agathe Snow, 2007

Installation by Jenny Holzer, 2007

Cucuteni figurine, 4050-3900 BCE

Photograph by Tseng Kwong Chi, 1986

Album cover by Jean-Paul Goude, 1981

Photograph by Robert Mapplethorpe, 1978

Bowl by Raku Chojiro I, c. 1580

Print by Jean Arp, 1956

Painting by Hayv Kahraman, c. 2008

Photograph by Roger Ballen, 2001

Painting by Michelangelo Merisi da Caravaggio, 1600

Installation by Toronto Public Space Committee, 2007

Drawing and installation by Niki de Saint Phalle with Jean Tinguely, 1966

Hat by Nagi Noda; photograph by Kenneth Cappello, 2008

Still from film by Ridley Scott, 1979

Vessel, date unknown; photograph from visitourchina.com

Photograph by AEvil, c. 2005

Art concept by Sol LeWitt, 1998; photograph by Caitlin Healy, 2008

Costume by Icelandic Love Corporation, photograph by Bernhard Kristinn Ingimundarson, 2007

Photograph, 1950s

Product photograph from WinterSilks, 2009

Photograph by Lois Greenfield with Australian Dance Theater, 2005

Photograph from FLABuLESS, 2009

Photograph from rhythmicwaves.com, 1970

Painting by Edward Burne-Jones, c. 1875-1883

Photograph by Rolfe, 1920s

Chess moves from Pressman Toy Corp., 1993

Series of subtitled stills from film by Ingmar Bergman, 1957

Still from film by Ingmar Bergman, 1957

Optical illusion developed by Edgar Rubin, 1915

Gates of palace of Sargon II at Khorsabad, 721-705 BCE

Performance installation by Marina Abramovic and Ulay, 1977

Terracotta sarcophagus, 520 BCE

Sculpture by Jeff Koons, 1990

Sculpture by Gian Lorenzo Bernini, 1621-1622

Photograph by wired.com, Drpoulette, Creative Commons

Photograph by huff_photos

Photograph from John Stabley, 2008

Photograph from the making of a film by Leni Riefenstahl, 1936

Photograph by Sylvietsak

Detail from fresco painting by Giotto, c. 1303-1310

Photo from Getty Images/AFP, 2008