This is the title page of Oliver Byrne’s 1847 edition of *Euclid's Elements*, the first six books. Using color and pictures, Byrne attempted to teach Euclid's geometry by minimizing textual discussion, including labels. This innovative approach stressed visualization. The picture on this page illustrates Euclid’s Proposition 47 of Book I, the Pythagorean Theorem. Oliver Byrne (1810-1880) was trained as a civil engineer but was also employed as a surveyor and a sometime professor of mathematics. Augustus DeMorgan described him as “eccentric and a minor mathematician.” However, his *Elements of Euclid* was proudly displayed at The Great Exhibition of 1851 and credited with being “one of the oddest and most beautiful books of the century.”

Page 45 of Byrne’s *Euclid* presenting Proposition 44 of Book I.

Page 117 of Byrne’s *Euclid* discusses Proposition 32 of Book III.

A complete copy of Byrne's *The First Six Books of the Elements of Euclid* can be viewed at Bill Casselman's website at the University of British Columbia, Canada.

For the most complete biography of Oliver Byrne to date and ideas for how to use Byrne's 'Euclid in Colours' in the classroom, see the *Convergence* article, "Oliver Byrne: The Matisse of Mathematics."