Note that it still uses double line-spacing, or something too close to that. (The embedded Scribd butchers some formatting on mobile, but I think line spacing i

Note that it still uses double line-spacing, or something too close to that. (The embedded Scribd butchers some formatting on mobile, but I think line spacing is preserved.) Double line spacing is wrong: it violates the principle of proximity, which is a cornerstone of all visual design―because it simply describes how humans' visual perception works. Practical formulation of the principle of proximity is very simple: there should be obviously more space around an item than inside of it, for the item to look like one integrated thing and not a bunch of them. This works on all scales. Double spacing makes it look like you can stick a line between two existing ones. The lines don't stick together anymore, and this makes the paragraph shaky, like it's falling apart.