Aspects of this topic are discussed in the following places at Britannica.
Close-up-of-two-straws-in-a-glass-of-waterClose-up of two straws in a glass of water. The straws appear bent owing to the refraction of light.[Credits : Steve Lupton/Corbis]
Plato-marble-portrait-bust-from-an-original-of-the-4thPlato, marble portrait bust, from an original of the 4th century bc; in the Capitoline Museums, …[Credits : © Gianni Dagli Orti/Corbis]
Detail-of-a-Roman-copy-of-a-Greek-alabaster-portraitDetail of a Roman copy (2nd century bc) of a Greek alabaster portrait bust of Aristotle (c. …[Credits : A. Dagli Orti/© DeA Picture Library]
St-Augustine-reading-the-epistles-of-St-Paul-fresco-bySt. Augustine reading the epistles of St. Paul, fresco by Benozzo Gozzoli, 1468; in the church of …[Credits : Scala/Art Resource, New York]
Rene-Descartes-lithograph-19th-centuryRené Descartes, lithograph, 19th century.[Credits : The Granger Collection, New York]
David-Hume-oil-painting-by-Allan-Ramsay-1766-in-theDavid Hume, oil painting by Allan Ramsay, 1766; in the Scottish National Portrait Gallery, …[Credits : Courtesy of the Scottish National Portrait Gallery]
Immanuel-Kant-pencil-portrait-by-Hans-Veit-Schnorr-von-CarolsfeldImmanuel Kant, pencil portrait by Hans Veit Schnorr von Carolsfeld; in the Kupferstichkabinett, …[Credits : Marburg/Art Reference Bureau]
Edmund-Husserl-1930Edmund Husserl, c. 1930.[Credits : Archiv für Kunst und Geschichte, Berlin]
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