When sans serif fonts emerged in the 19th century, they were used mostly at headline sizes, not body text sizes. But modern typography uses sans serifs at all sizes. Designs like Arial and Helvetica were meant to be comfortable for extended reading. I abhor Arial—it’s clunky and painfully overexposed (see system fonts). By contrast, Neutral, Bernini Sans, and Cooper Hewitt are newer designs that aim for svelte plain-spokenness, but without being bland retreads of earlier designs. Cooper Hewitt, designed for the Smithsonian, is free.