"It doesn't use shading, but it does use stroke length variations"

In this quote, John Robert Gregg is talking about a particular strategy utilized in writing or calligraphy. He mentions that this strategy does not include shading, which is using light and dark tones to produce depth and measurement in an illustration or writing. Instead, he describes that it counts on variations in the length of the strokes used. This might imply that the writer or calligrapher changes the length of their strokes to produce emphasis or to include interest to the overall appearance of the writing. This quote highlights the value of stroke length in creating visually appealing and reliable writing.