Turning Type Sideways

Jonathan Hoefler:

This month, researchers made official something that typeface designers have long known: that horizontal lines appear thicker than vertical ones. At left, a square made from equally thick strokes; at right, the one that feels equally weighted, its vertical strokes nearly 7% thicker than the horizontals. This phenomenon, central to typeface design, has implications for the design of logos, interfaces, diagrams, and wayfinding systems, indeed anywhere a reader is likely to encounter a box, an arrow, or a line.

Published in the journal Vision, this peer-reviewed paper confirms that most people overestimate the thickness of horizontal lines. This is the very optical illusion for which type designers compensate by lightening the crossbar of a sans serif H, an adjustment that’s easily revealed by looking at a letter sideways.

Good advice:

Design not for what we expect to see, but for what we actually believe we’re seeing.

Wednesday, 16 January 2019