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Symmetry in letterform design doesn’t mean perfect mathematical symmetry—you make adjustments to each letterform to create balance between the letter and the white space around it. B, P, and R may all look very similar, but the upper bowls of the letterforms are often different to adjust for letter density and white space.
Jessica Hische • In Progress: See Inside a Lettering Artist's Sketchbook and Process, from Pencil to Vector
High-quality typesetting generally prefers text figures in body text: they integrate better with lowercase letters and small capitals, unlike runs of lining figures. Lining figures are called for in all-capitals settings (hence the alternative name titling figures ), and may work better in tables and spreadsheets.
Robert Bringhurst • Text figures
Ad-Agency Secret #11: The Psychology of Typefaces Typefaces can be playful. Authoritative. Creative. Beautiful. Dramatic. Fancy. Odd. Refined. And yes, even downright hideous. And because of this, different typefaces can color our messages with different meanings.
Drew Eric Whitman • Cashvertising: How to Use More Than 100 Secrets of Ad-Agency Psychology to Make BIG MONEY Selling Anything to Anyone (Cashvertising Series)
Fonts by Hoefler&Co.
typography.com