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(1-1) National Sleep
Foundation.
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(1-2) Illustration by Reynold
Brown.
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(1-3) Courtesy of Yukon
Archives.
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(1-5) © Christie’s Images/The Bridgeman Art
Library.
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(1-6) © 2011 The M. C. Escher Company,
Holland. All rights
reserved/www.mcescher.com.
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(2-1) © Bettmann/Corbis.
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(2-3) Graphic Courtesy of Ross Rhodes and
bottomlayer.com, used by permission.
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(2-4) Adapted from John A. Wheeler, ‘Beyond
the Black Hole’, in H. Woolf, ed., Some Strangeness in the Proportion. A
Centennial Symposium to
Celebrate the Achivements of Albert
Einstein (Reading, MA: Addison Wesley,
1980).
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(3-1) From Victim of the
Brain, a film by Piet
Hoenderdos.
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(3-2) Reprinted from Olaf Blanke and Thomas
Metzinger, Trends in Cognitive
Science, 13(1), January 2009, p. 11,
figs. 3b and 3c, with permission from
Elsevier.
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(3-3) From The
Neuroscientist, 14(4), 2008, fig. 3, p.
322/ © 2008 by SAGE Publications. Reprinted by
permission of SAGE Publications.
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(4-1) © Rheinisches Bildarchiv
Köln.
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(4-3) Graphic courtesy of Ross Rhodes and
bottomlayer.com, used by
permission.
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(4-4) From B. Libet, Mind Time: The Temporal Factor in
Consciousness,
(Cambridge, MA: Harvard University Press,
2004).