6.2 Pablo Picasso, First composition for Guernica
(http://www.galilean-library.org/images/david/picasso2.jpg)

Self-Portrait, Leonardo da Vinci
(http://www.artchive.com/artchive/L/leonardo/leonardo_self-portrait.jpg.html)

6.4 Star of Bethlehem and Other Plants, Leonardo da Vinci
(http://www.wga.hu/frames-e.html?/html/l/leonardo/11nature/)

6.5 Chris Ofili, Prince among Thieves with Flowers
(http://www.artnet.com/Magazine/features/saltz/saltz10-30-4.asp)

6.8 Yvonne Jacquette, Three Mile Island, Night I
(http://hirshhorn.si.edu/collection/record.asp?Artist=Jacquette&ViewMode=&Record=3)

6.11 Rembrandt, Cottage Among the Trees
(http://www.metmuseum.org/Works_of_Art/viewOne.asp?dep=9&viewmode=0&item=29.100.939)

6.12 Julie Mehretu, Untitled, 2001
(http://www.contemporaryartproject.com/cap/images/big_art_mehretu.jpg)

6.14 Paul Noble, Nobspital
(http://www.artnet.com/magazine/reviews/kardon/kardon3-17-4.asp)

6.16 Works by Raymond Pettibon
(http://www.artnet.com/artist/13422/raymond-pettibon.html)