In their article "Numerical Patterns and Geometrical Configurations" on pages 82-92 of Mathematics Magazine 57 (1984), Harold Dorwart and Warren Page note that the venerable David Hilbert once remarked "...there was a time when the study of configurations was considered the most important branch of all geometry." "Today," added Dorwart and Page, "...most students have limited knowledge about configurations-except perhaps the Pappus (9,3), the Desargue (10,3), and the Petersen graph (the logo on the cover of the Journal of Graph Theory)."
"Puzzles and Games on Word Configurations,"
Word Ways: Vol. 34
, Article 2.
Available at: http://digitalcommons.butler.edu/wordways/vol34/iss4/2