I like to work with elements so that there is geometric rationalization between the sizes of them, and the spaces between them. I usually work with set "unit"

I like to work with elements so that there is geometric rationalization between the sizes of them, and the spaces between them. I usually work with set "unit" sizes. Any time I have to make a decision about the size of something, or a piece of negative space I go to one of these sizes: 3, 5, 7, 9, 12, 16, 21, 28, 37, and on up by the factor of .75. Here is a video of my method in action: http://www.youtube.com/watch?v=7i8gGqbNIHg http://www.youtube.com/watch?v=7i8gGqbNIHg The pioneers of typography only had a few sizes with which to work, and in many ways, that restriction was a blessing. You have to create your own restrictions in digital design. It doesn't directly translate to web design, but typographer Jan Tschichold made some solid recommendations about determining the margins of books. I outlined those recommendations here: http://www.kadavy.net/blog/posts/determining-proper-book-margins/ http://www.kadavy.net/blog/posts/determining-proper-book-mar... For understanding the subtle geometries of design, I recommend The Geometry of Design by Kim Elam. I'll also have a few chapters about it in my upcoming book, Design for Hackers.