The Stroke introduces a comprehensive theory of writing, exploring the underlying principles behind letters, whether written by pen, pencil, or brush. This insightful perspective is not focused on the art of calligraphy or aesthetics, but rather, it delves into the process of creating letters in writing. Starting with the significance of white space in defining letters, Noordzij then delves into the precise construction of strokes using basic geometric concepts. His theory aims to bridge the gap between written and typographic letters, which emerged with the advent of printing. Considered a pioneer in digital typography, Noordzij seeks to liberate typefaces from the limitations of metal.