When I was in graduate school, I took a type design elective taught by the excellent Cyrus Highsmith
. The first week we each gathered and refined the basic formal elements that would define the nature of our typeface. In my case, I wanted a display face optimized for the screen — with rounded slab serifs, a roomy x-height for readability, and bowls with a distinctive tear shape to them. What emerged was Shoestring, a "simple, friendly, open type face for blogs. Suitable for boilerplates and headlines. Optimized for use on screen."