Illustrations
1.
Docs-at-the-box. From Triangle Employment Weekly, News and Observer Publish-
ing Co., September 1, 1993.  4
2.
Cystic thing in Rohan’s jaw. Courtesy of Rohan.  5
3.
Attending pointing. Author photo.  19
4.
Indexing, targeting: Toshiba
ct
exhibit,
rsna
meeting, 1996. Author photo.  20
5.
Gaze tracking on a chest x-ray. Courtesy of Harold Kundel, Department of Radiol-
ogy, University of Pennsylvania.  23
6.
Camera obscura. From Athanasius Kircher, Ars magna lucis et umbrae in decem
libros digesta, p. 128, plate 28. Rome: Sumptibus Hermanni Scheus, ex typographia
Ludovici Grignani, 1646. Reproduction courtesy of Bernard Becker Collection in
Ophthalmology, Washington University School of Medicine.  25
7.
Craniological specimens drawn with wandering optical axis. From Petrus Camper,
Dissertation physique de Mr. Pierre Camper sur les différences réelles que présentent
les traits du visage chez les hommes de différents pays et de différents âges, sur le beau
qui caractérise les statues antiques et les pierres gravées, plate 1. Utrecht: B. Wild and
J. Altheer, 1791. Reproduction courtesy of National Library of Medicine.  27
8.
Marcel Duchamp. Nude Descending a Staircase No. 2, 1912. © 2006 Artists Rights
Society
(ars),
New York /
adagp,
Paris / Succession Marcel Duchamp. Repro­
duction courtesy of the Philadelphia Museum of Art.  28
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