Why a Type Designer Draws the O Too Tall
Almost everything you read was shaped by a type designer, a person who draws the letters that make up a font. A single font can contain hundreds of characters, and every one must look as if it belongs to the same family. Designers often spend months or even years on a typeface, adjusting curves by tiny amounts that most readers will never consciously see.
Some of the strangest decisions are meant to fool the eye. A round letter, such as o, is usually drawn slightly taller than a flat-topped letter, such as H, and it dips slightly below the baseline, the invisible line the letters sit on. If the round letter were exactly the same height, it would look a little smaller, because a curve touches the line at only one point while a flat edge rests along it. This small extra height is called overshoot, and it makes letters appear equal.
Spacing is just as important. The open space inside letters, called counters, and the gaps between letters shape how a line of text feels. If two letters sit too close, they seem to clump together. If they are too far apart, a hole opens up in the word. Designers adjust particular pairs, such as an A next to a V, in a process called kerning.
To test a design, the designer sets real words and paragraphs in it, prints them, and reads them at different sizes. A font made for road signs must be clear from far away, while one for a book must be comfortable for hours. The goal is a typeface so well made that readers think only about the words.