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A line-length page using a 0-90 character ruler with dotted gridlines and a shaded 50-75 zone over two real body paragraphs to show the optimal measure.
Summary
A page explaining optimal line length by overlaying a character-count ruler (0 to 90) and a highlighted 50-75 zone on top of two real body-text paragraphs.
Visual description
Standard guideline layout on white. The left column holds "Line Length" and a short paragraph recommending 50 to 75 characters per line. The right is a large rounded pale panel. Across the top, cobalt numerals mark a horizontal scale: 0, 35, 50, 75, 90, each dropping a dotted vertical gridline down the panel. A soft lavender band shades the 50-to-75 region. Two dark-violet body paragraphs (about Docusign joining the Science Based Targets initiative) sit behind the ruler so their line endings can be read against the scale. Running header: "Typography / Line Length / 43".
Key takeaway
Overlaying a literal character-count ruler and shading the recommended band directly on running copy makes an abstract readability rule measurable and obvious. Using real sentences rather than placeholder text shows the rule in genuine conditions.
Reuse notes
A clever reference for documenting measure/line-length in a type system. The numbered ruler plus shaded optimal-zone diagram is reusable wherever you need to teach a numeric typographic guideline. Keep the sample copy real and at the body size the rule targets.
From this deck: Line length character-count ruler
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