"Dont confuse legibility with communication. Just because something is legible doesnt mean it communicates and, more importantly, doesnt mean it communicates the right thing."

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The studies I've seen about readability and legibility tend to focus on a specific set of metrics: size, not just the point size, but things like the size of the lower case letters as a proportion of the overall letter height, and line length. People simply can't read really small type set in really long lines.

— Michael Bierut