Practical Polygons

Title: Practical Polygons
Author: Donald Hammond ("Troy")
Year: 1196
Subject: Numbers considered through polygons.
http://www.dozenal.org/drupal/sites_bck/default/files/DSA_troy_polygons.pdf
This powerful article discusses numbers in the form of two-dimensional plane figures, explaining how polygons show the nature of number and demonstrate the superiority of twelve as a counting base. Richly illustrated and explained.