[Geometric diagrams in margins of text of first printed edition of Euclid's "Elements," which they illus.: 2 diagrams at left of text (page headed "Liber")]

[Marcus Tullus Cicero, bust portrait on page of Latin text]

[2 botanical illus. and page of text]

[Geometric diagrams in margins of text of first printed edition of Euclid's "Elements," which they illus.: 2 diagrams of text (page headed "II")]

[Page of text in Physica, with decorated initial Q]

[Geometric diagrams in margins of text of first printed edition of Euclid's "Elements," which they illus.: 2 diagrams at left of text (page headed "Liber")]

[Geometric diagrams in margins of text of first printed edition of Euclid's "Elements," which they illus.: 2 diagrams of text (page headed "II")]

[St. Joseph's church within walled compound in Beijing; includes Chinese language characters on right and left margins]

[Geometric diagrams in margins of text of first printed edition of Euclid's "Elements," which they illus.: 2 diagrams at left of text (page headed "Liber")]

[Geometric figure of earth, sun, and moon calculated by Aristarchus to approximate real scale of the solar system]

[Geometric diagrams in margins of text of first printed edition of Euclid's "Elements," which they illus.: 2 diagrams of text (page headed "II")]

[Geometric diagrams in margins of text of first printed edition of Euclid's "Elements," which they illus.: 2 diagrams at left of text (page headed "Liber")]